Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb66d474b273a88…

MALICIOUS

PDF

68.8 KB Created: 2021-05-30 10:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186516c67ff86e15a43fb634dedf21d5 SHA-1: 4535a7f128d1ce59185c37566fa8ce1516f256da SHA-256: 2fb66d474b273a88db7b0f82eb42183971a4c8632600bee45dfdc5b9cb041bbe
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a link farm or distribution mechanism for malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd8edd7e81f8aa96e168c189f844e47d/44258470996.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc09c32a5---lafotufakunazojorokiwad.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d8d9e4e2---51998737125.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6c44e3119a1e0f27cfd4cf556635346a/58223704414.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160849c132aa2d---15546291389.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ada6b58ebb0148d750764e2610770235/gekunexugasasafi.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ni4hu5dlhpq1e65vrq2ga44hp4/86727501924.pdf
    • http://alarcon-v.com/editor_upload_image/file/16840600488.pdf
    • https://angkortaxiservice.com/userfiles/file/tatalikadexetadumu.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c638219e---tikapusagovijibarakibevum.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/aa599a2c7b7a08269b38cadc56d743a3/15586431281.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab12d3305---tegufutilodaz.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607642d689e39---zumakeveroteredikovifijun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=laboratory+tools+and+their+uses+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfff.bin
0e0396320238dbb24127a23d8ca664b970215403cf78cb9fc6cb2a50f6d957da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 5312 bytes
font_01_sfnt_off0000e209.bin
eef4473b0f188cf687c558c3d864f09403a572a275925bbe2d30cc079abe12b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 10592 bytes

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