Malicious PDF — malware analysis report

Static analysis result for SHA-256 378cdf2bb837dd4b…

MALICIOUS

PDF

82.5 KB Created: 2021-06-28 08:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a81ec4dd12a94be10f560fc198ad5f74 SHA-1: 6a7089df8141078bda54c9411f981df97140dfb8 SHA-256: 378cdf2bb837dd4b47a39933c21b601a4249819f67f926a4d52016c97d75f3c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=bece+2018+french+questions+and+answers
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vhamqin0njva0qvihjblqf9pcl/59156638486.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bggsol67bbkicdu7ql11rf8sir/8068540419.pdf
    • http://woodbridgeabw.com/uploads/files/70253604313.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f50dc941---10950138383.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/85cc6d5699ccd647fc716c200b33b2da/jaledobetudori.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6222140b4e6826aa6dd55472fa993df3/xeponawemo.pdf
    • https://strategieb2b.com/userfiles/file/perig.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099103b2f0b8---dedudomo.pdf
    • http://showplus.ae/userfiles/files/98527713575.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071753f2e32a---bunuwusubusobuliwusolasi.pdf
    • http://bioident.pl/photos_fck/file/27421963958.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49163613568.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d58e498998b2f76452ab8f29e40fd051/26258151999.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/07fe1abe0d3eab6175fa5b2bf5c804b5/5341368146.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e59c79f0---xatudebolokijegedet.pdf
    • https://autoteam.in/ckfinder/userfiles/files/93695103.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f43a3475---51906627298.pdf
    • http://kayamedbursa.com/userfiles/file/gugigotibubakude.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8641419b---63809447732.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3419e4ba45bf6fa5d731e6aab89bb5d7/wotupalibajumo.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/naredtf869ur7nkauagp7ja32s/bodimex.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_off0000da9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16792 bytes
font_01_sfnt_off0000f2ad.bin
7f23b74f349c18f8b7a975010fbf100bab917b93d1a83e0a34636c0f694a51f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 17624 bytes
font_02_sfnt_off00011ff7.bin
b8dea7460cfa3b9f463ba27a524a20a594106fffdf86cbe91eafe4b71516496d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 11416 bytes