Malicious PDF — malware analysis report

Static analysis result for SHA-256 567a909ed04657ca…

MALICIOUS

PDF

100.0 KB Created: 2021-09-15 23:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57a8f3bfcbb97cf271a88fa4dba75880 SHA-1: d0a4ced88c1d33360984ce446b203411ea2d689d SHA-256: 567a909ed04657ca9deaa1977b11488e06a29364ab0511f29977dd9ac08f2cf0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure for browser extension or update installation, a common social engineering tactic. It also includes multiple links to potentially compromised websites hosting PDF files, suggesting a distribution or download mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://thegioidongphuc.net/ckfinder/userfiles/files/24568553925.pdf In PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210908205948.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/ropebekuwup.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/kirexik.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fdda07eb---9076957756.pdfIn PDF document text
    • https://zhansq.cn/upload/file/60903148212.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/welanudebowadosuba.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6b5cdce---11995892593.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/30015160224.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/44960216711.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/muriji.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/54530896578.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/nekarokod.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4350026f5f9ec46f97b7eb8e8bc87a2/jaxaxiwifixowogapewo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/siwalazojoje.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/8481469215.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dugolovegifokokigiwokidot.pdfIn PDF document text
    • http://idroter.org/userfiles/files/33641818900.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/numevije.pdfIn PDF document text
    • http://moneymaker-gold.de/files/mokokilur.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/ronapole.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/gugeduzowapuge.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/61894892731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+chrome+tab+view+androidPDF 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_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 10888 bytes
SHA-256: cb801d2ea75e525f196f0f67f09b120a72d1e558e5241bbf76960c6fe353f232
font_01_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DE 18700 bytes
SHA-256: 0b026d85baa580b30f536984dbd5c706aea51d60215f763368c189cc29c8454f

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