Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e1219e7435e14…

MALICIOUS

PDF

74.6 KB Created: 2021-07-04 11:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32e2fb9e2d1e8a1a2a0d3dc24cbaed52 SHA-1: cdd2fa42c291f109686dda8fa3a21975f7423b20 SHA-256: ab4e1219e7435e140712c41b1bcaf38a587a2f4fe34c0761bc8242ee5ec869d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=sweet+baby+mp3+download
    • https://luyenthitoeic.info/userfiles/file/12820254430.pdf
    • http://zovsh.com/Uploadfiles/files/kifesovejilivetogiwinunaj.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/37161597728.pdf
    • http://vinhthuan.com/upload/files/84010457610.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2c6e38754695d52083c284ad4912a70c/35113516378.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512103306687353.pdf
    • https://girilawfirm.com/content_files/files/butujoz.pdf
    • https://jagominum.com/contents//files/tuvawu.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2780e5d20fca4bb2100f05e24df3bd58/fudiganedowokiko.pdf
    • https://iwnta.com/userfiles/file/57314874626.pdf
    • https://bonacorsi.it/file/faxikuvapigerovuzopatoxiz.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210603110303.pdf
    • http://verduciautodemolizioni.it/userfiles/file/86207854481.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ziretanibevev.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6f69ecc9---92565901029.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jqc9g69b0o5qa21gce2b92irh9/wezulimivesop.pdf
    • http://classicalgardenfountains.com/uplds/file/70225852108.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/70f0deb11967cc447ac0c83681a94967/75148310036.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820136bdbd7---kirimubedan.pdf
    • http://muszempilla.com/files/file/59824419624.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c77243096---94133196170.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/70640260545.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf84.bin
030ae87ef7999479723ee89fb28ce03d6546f139c0aa57d0136d3c05ab425b41
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 10780 bytes
font_01_sfnt_off0000d832.bin
710aa014242bf4b35a0a372092eb9842f3941d151e5542a8db3a4ad687913818
pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 17020 bytes
font_02_sfnt_off0001051e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16792 bytes