Malicious PDF — malware analysis report

Static analysis result for SHA-256 3974331ba8586ffe…

MALICIOUS

PDF

103.3 KB Created: 2021-06-24 09:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeb51c56f75153d432a551e84d5a6dde SHA-1: 524a11038d3850b23d18adbd5d7da03c1896949f SHA-256: 3974331ba8586ffe60985dd66ae1dba9a1c743039262ff8c156dc0aeb37fe93e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=apocalypse+of+abraham+pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f3b5fb9901dda67e924a48b85be94446/79863249999.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l6ne3ublhma0ks5pajkdej8lnh/sifuxelapusapunubesibijif.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6200b1565a820d7dfbd237501e5dea58/18690546667.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1de5949be2653de2e5736386b15d6117/85976865843.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8m1ik9j0fbe1pqgtv2bs11vei/11357953554.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/97ab34c018d4d8454cc9f8e192b61f49/64684343279.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/37fd37fc32bb460660e31c929dc3cad1/bubajebilabib.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc7949e80---19276657436.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160743ab538d97---33526396857.pdf
    • http://hrudolf.com/userfiles/baguritedodikavisopabi.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47768d4c25---63624955986.pdf
    • http://www.amedna.com/userfiles/files/96074277222.pdf
    • https://menu2uplus.com/images/file/pirapeniwalorabiduni.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c142b0a429f---robedazukarepus.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/00ee8c5f2687962f2acf0b6968494db0/nexonatimefazuref.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/48660911164.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/00iiamtthk4cs00aoaguv3a1d7/musososisujeditineri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ea4.bin
8f35034b4c83e3fd149fe6f0b67758ef7378c59beed61babcdbd08eade9c4681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 5628 bytes
font_01_sfnt_off0001619e.bin
5d9ee3aeda8b7f60a46f1bce0277991155f0cb1e99b290574fe0f5b82fbe8f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1619E 14188 bytes

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