Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bc7d2221d8bc02…

MALICIOUS

PDF

85.9 KB Created: 2021-06-14 04:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e619176abe3bcf0f571fa745c8b57ce SHA-1: 76930bd3838684c3768ca67fe2c25063d0ec4d0e SHA-256: c1bc7d2221d8bc0226c53316b60c8dff7bbe01491332c1bb7769f58d27e89d23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it is used as a link farm to distribute malicious content or phish users. The file's structure and embedded URLs indicate a deliberate attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=lte+band+71
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9f32d45c---76515642972.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f70215216929928f63d44f62f477b657/74028511716.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2b0f612d054fafd5f4449882a9ec4b1e/lefewegudeluvadenipe.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87213523a---tutabujipodosoj.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92f9a5b07---55161209404.pdf
    • https://alate.org/admin/fckeditor/editorfile/38802580395.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/dc9486cfe6baecce9429c1537fc6193e/misuwinigebawimipanuxabeg.pdf
    • https://aronabritcan.com/userfiles/file/wadidonotovuma.pdf
    • http://beachfirebrands.com/userfiles/file/77456251677.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ab6525fca27f6a4c46811616c7ba6d5f/junigutotegu.pdf
    • https://techson-cctv.com/upload/file/botegipokegikibijawiraw.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089ead04b0b4---45276186718.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782da52f604---wikenasowobanuvi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3541ea7a---93239594285.pdf
    • http://toshiba-center.ru/uploads/files/17807938129.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/16081293460.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb8a51a8d---29234739142.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_off000112d3.bin
61cd318d6162f1db8237d043fa70f6c7d83ed403afbfc6c32fbf7d546aa794b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 4724 bytes
font_01_sfnt_off00012305.bin
1a104bed679a5142c373ae20f3df8da43739855e8244f507b4eb4735d428349d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 11592 bytes

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