Malicious PDF — malware analysis report

Static analysis result for SHA-256 abda4c04f5db12a5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 08:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f2e2d0bd3e57ee1e88963b8949c3d23 SHA-1: 7f381d14fff9d791f4ac7c30e5f723739b2fd514 SHA-256: abda4c04f5db12a5f66d34ccd250bc3ce20448acb801d68d6557cb68ce4da6c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it is a link farm pointing to compromised websites and potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'cmd3u7ltda9tee8sqjs/furodivamuriwaxiwos.pdf' and a URL containing 'utm_term' suggests a lure to a site that likely hosts further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://smidgel.ru/uplcv?utm_term=thomas+and+finney+calculus+9th+edition+solutions PDF link annotation
    • http://ssatripoli.org/userfiles/file/72417975693.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/14660522083.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/19879746509.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/xitenitexasugobolabano.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f9a117b8cda57f1906478522a81541bb/kumuvejuruvus.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/36200706460.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/90770360020.pdfIn PDF document text
    • https://best-label.com/upload/files/togutisidud.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109231531226171.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/77343645491.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xagimupowesuvivipupoba.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37692982911.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210918165937.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kf3p3bdushorme23nttb1pno13/52721993817.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1tmdkgpcmd3u7ltda9tee8sqjs/furodivamuriwaxiwos.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2bc49559---kerozubagekigavibefe.pdfIn PDF document text
    • http://jarosi.hu/files/file/debufejog.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ralisepujedamatamowupa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443be257d3a---29611518698.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/56500927614.pdfIn PDF document text
    • http://01host.ru/userfiles/files/juwis.pdfIn PDF document text
    • http://newo.ru/files/files/wepetodetowibukuteriw.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/zodixu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/68924092825.pdfIn PDF document text
    • http://www.etoilIn macro / runtime command snippet
    • 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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 15232 bytes
SHA-256: 49809153358553a8aa853917f94f51391f40a268a09573a8d597286cbb78572b
font_01_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10984 bytes
SHA-256: 208c6ffa37ef2ab69732209e10f2da825950a07cc7f78905cf5c8b36f4eb7365
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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