Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc7a6c3db1c7960…

MALICIOUS

PDF

85.0 KB Created: 2021-06-18 07:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c8d986111343d4a9f8f48bcf8822ce6c SHA-1: d06d20e2b472dac54dabb33b1b1b0d4e82530f1d SHA-256: efc7a6c3db1c79608a83e73c5544685f0b2e32ddc8ab29e638d1f7abc81b2cea
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the presence of external URIs and compromised upload links points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=gta+5+best+paying+jobs PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/77a9c3bded40e93ab7e86ad2cb281f77/rekova.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/69794701378.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb433ff91---25314664546.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8241ee4c83---72531171593.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/guh9h2e13u45kh48886jt3ofi2/rovusodujurasolexikaninoj.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d209ff112649ff9632b7fef2815e86ca/52712146074.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/35055987445.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pulobosupetogudamixa.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ef3mtaegv5jlbgb7sheken1co4/koridiv.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vijulakoxo.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/sazuxumufimovogol.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d73351b3---81931151860.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lb8kfmmacd3q0bpvk82ltr4sr2/61119959683.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/3dda773e1f582b786a3f500285c458db/revivigipatudavodep.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/20078544f76331bd0bf78bf9c07b7495/79872232874.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/40706343730.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/33438875223.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/73350538986.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e3d8fabab3051b3d6eec8b723f7c6570/sufipumeduparigujoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 5120 bytes
SHA-256: 6108335b71fdebee6551e2c45f9ced77203f933ad74e273843af1ac4f2e902bc
font_01_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 10832 bytes
SHA-256: e58c63a28a013acf01e373f65be29ea26670c42e568ef98f20d6d0c461f9ebf0
font_02_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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