Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac691ee70bd3ba6…

MALICIOUS

PDF

103.4 KB Created: 2021-08-11 13:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8c45aacf535c94fe12d6c2f7149fa26 SHA-1: ade3509d05875fed0632f193d453c25ed2cf1f0d SHA-256: dac691ee70bd3ba65060d62e50a7277f9f639e1a9aacac598328afb67d87b63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=isocuantas+e+isocostos+ejercicios+resueltos PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e44b24e406---89274884700.pdfIn PDF document text
    • https://bselink.com/userfiles/file/67293654976.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/poxumomoxeduvodipalu.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/30025701204.pdfIn PDF document text
    • http://carszana.com/image/upload/File/17690778150.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/86675c9ed103a73a38e08d6887490332/xosemulusejebab.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/t8798pssged41ou8im6vsi9o70/81879259401.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gukawokux.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/f0375co8sdbjs5f0m8sfjbf3li/bazobo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdea814eb02---97015753751.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/53228985683.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfcb58d4d2---84433052376.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/808429313.pdfIn PDF document text
    • http://ashioke.com/images/library/File/wubojaxomasawunivova.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/54654245016.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/damemutelax.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c40058221dfaed69ede7f15571fd6a84/mepekesepemaluka.pdfIn PDF document text
    • https://nevisnews.com/userfiles/94690994788.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/lavasenanumofizedipevi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/152js93v33pkglpicmb0n2njh3/88805131738.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6ca3c292b5e40600e22e0bd5bbe8f6d6/bekudufitimigaki.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/16ff5a6799dfb81e674e04014634bcd2/39925809257.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/14401348651.pdfIn PDF document text
    • 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_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 10404 bytes
SHA-256: 004e4ca689390cd0a7d93caf7dd196014a9707b282719ca9d795909755cff78e
font_01_sfnt_off000143eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EB 19348 bytes
SHA-256: b9ab78ec047a91082d9665d793a1bd57ee77436d2fe468b0a5fa5299f6b2c370
font_02_sfnt_off000175bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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