Malicious PDF — malware analysis report

Static analysis result for SHA-256 0038d4ea7d98f211…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 14:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6619f2d7c66c0f1e94ea4671965320b3 SHA-1: 213f81d332a5d15074f6c209b14954410694c8b2 SHA-256: 0038d4ea7d98f211971bcc0ab52127dd001be9ee8d976ebb9cfa85917250ef6f
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious activity, including links to algorithmically generated URLs hosted on compromised WordPress sites and disposable domains. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document attempts to trick the user into installing or connecting to remote support tools, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate this is a malicious PDF, likely a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cozycornerexpress.com/uploads/files/titiziwabefezilalujona.pdf In PDF document text
    • https://nhahangthanghuong.com/uploads/files/zigamopep.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f3ad7b5efc103c750d632c578d94450/3010317563.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/murekopapamomisufonize.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b91ba1a83---71412091281.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdfa3efe5d---nazuwokubixoxewew.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160909b15ad52c---77423244271.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/46179900131.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ea02dd3ba---78376019747.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbff1dc993---watepewiketatavegirag.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/45473825293.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/memogan.pdfPDF link annotation
    • http://zabradli-znerezu.cz/userfiles/file/44282217660.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/javetodus.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab86d10a954---kuvoxirimagitupabado.pdfIn PDF document text
    • http://zaiger.ru/img/file/xejobiseparimebasubavu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/c08k9i745arjjt8e05l3khkb31/kipajulolinixubexifawezux.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/17360570496.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mabozawizexa.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8e8917e6605bef5a373fb1e27152fc78/69881631434.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hmhatfl4v59u4er5qn1v3gk6m6/80362990079.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a11471181621e15d1871a6c0afcad950/34676775014.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607635bdc20fc---zisabetikonitel.pdfIn PDF document text
    • https://allianztc.ro/files/file/91581746230.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/30452365721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pediatric+protocol+4th+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 16284 bytes
SHA-256: 61f942dc5eecee81fd6674f67b799ce335dff1d3bbeb611bda36ca7abad0f12b
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10628 bytes
SHA-256: e9dcc507d77d4c630dcc7ff04759308cf5fc1a9782a99ecda132021d36252646

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