Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1250b594b63a769…

MALICIOUS

PDF

77.2 KB Created: 2021-04-30 06:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9edbbabacd13c0ed4636cccef9a320 SHA-1: ec28cf24927e2c8f7ee574021e6aebac01189bd5 SHA-256: e1250b594b63a76913f43df9998a479ae251c3ce63fc20c556c5ed5946cf51ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'score match hack mod apk latest version', suggesting a lure for potentially unwanted software.

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 http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0765c7dc---newuw.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e77db105---98450848152.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc6a6cc6b---rufani.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607687c7ba5d1---serup.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ggpe5fugv33rr3i21vd1krqjkn/niginetex.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c417180d29615a805426c732b93a37f4/danigozebamelajogajib.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4ca80a79---detirapuvivevosa.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa06a6044b---gudepubuwiwasaxukobarudo.pdf
    • http://alkanboya.com/files/file/%5C/keparisanidanetiwetoneza.pdf
    • http://akcjonariusz.com/UserFiles/file/40684575753.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd871072f---29255505964.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160788ae067849---guwib.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/2abf1d5929414a2a1a0326495932403a/42183484940.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac31824676---87762856149.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3510ee8e---sulapawubifezebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=score+match+hack+mod+apk+latest+version
    • 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_off0000f0e6.bin
ab5eb3051710c54b40975c7d316a7433abce5794d76c8c7314e7c69fd155d74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 5540 bytes
font_01_sfnt_off00010394.bin
e0fb0100c2f8386c07f5bc49611f2d8b4c67c70aec3ebe36048712533bdc371e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 10624 bytes

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