Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bef5bf9f872c67…

MALICIOUS

PDF

131.9 KB Created: 2021-06-08 10:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bf5b5a02e40d8ae8ee05e83e85753b9f SHA-1: 0ec119bad1a3a2a12f76513cce9b4f7f0a58480f SHA-256: a7bef5bf9f872c673d78d7a8f11929cc145d6f7956c457c3e42dd938cca7a9c4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other domains, indicating a likely phishing or malware distribution campaign. The document's structure and embedded links suggest it is designed to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wastran.ru/uplcv?utm_term=super+mesleki+geli%25C5%259Fim+kuram%25C4%25B1+pdf PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ffddd519052236e410a0ebc1ada97765/23143552575.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i74o71u94jvn6lceaj02f140n1/mepinuxer.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/67729982454.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609439a657ba1---14499042275.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/befiwagunoxuv.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bde764e612b---96605897879.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ccb3c78b7fbbb1ec07c53540e31a433e/naguzeluvexukezuregopo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a4c05a9818ad26e2f953bc5a516fc070/20321585417.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cgclq1fanjddohh8fapccm3e7r/navidobabewasebabebateji.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/55446207073.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/clk3iqt23piic9ndqhi69iq759/fubokovokusuzizenuvoneda.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/33ee68da8b8d8babf7e8d43d7f1d01e0/ruwidupu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2de69f4de---wavajejo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/292b84dbfba18d378763c22a51d1f67c/20682323341.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14ce5d3e5---68559169746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B6 5808 bytes
SHA-256: 84d5c66e431071b35498a8e24f152b175823d84078392893016367f80bc1a6dc
font_01_sfnt_off0001d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8E1 13020 bytes
SHA-256: 809fcd079fc88f724b43a577776d95693534bbb59bc094660d9dde1869cdf828