Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a236d4f8e3647e…

MALICIOUS

PDF

68.8 KB Created: 2021-05-19 11:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d584121ef5c5051f638d8a368bdfd23 SHA-1: 510c7a66adb780e2272992ddf7f0962ece0fd7aa SHA-256: b2a236d4f8e3647e6da5b45db5fc287e9f3cbaabc8ef7d709f066bccbe88b82f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious content.

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://drafthe.ru/uplcv?utm_term=escape+games+unblocked+games
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2aa031f0---komegukavoz.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747869d01b---vixuwob.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/890e67c4a13434460cf3430119f1ad29/bitenurojaregadivo.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/452ec894f2dbb2cb5b82cc8383e3ea84/87352018226.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/ddfeef5c7640707031cc570618ec39d6/zejasadewufe.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3280668cb030a84c0a834e7695c2ff25/nemokunive.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/709f9cbc6a5fa099db3699c3cb175e94/97320233559.pdf
    • http://alituncer.com/userfiles/file/45078409256.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pmob96u3f5sel2t0seb6avl845/57485596488.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/30884fa24241f60657a1cc341ae954c8/nixojumezutunofom.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ce050ec1---65929800061.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d112146a93237e96b3537b3b07e7644f/bafotigukesabepasukanojen.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608390773e21b---wukodogezoxepefuzovav.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7de0ed77---pikot.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_off0000d061.bin
99880b9f252269869ea0221564e4818a0384b53f62980ff64ec872ea88e27c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 5460 bytes
font_01_sfnt_off0000e2e3.bin
07caea57e9235e9a3e205bc0f12372f06d050049e98bdb11790eb3427ede057c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10460 bytes

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