Malicious PDF — malware analysis report

Static analysis result for SHA-256 4851cc2e56ec4df5…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 18:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6f158de13dcbe86a8fcdc38771d54185 SHA-1: 0b5eb3ee4f55ee3025c463bf90c4096fb455748f SHA-256: 4851cc2e56ec4df5f58684d7dc6018c8c774bb8310bb7f0904db889dbeefc83a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious intent.

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 https://crewmak.ru/uplcv?utm_term=importance+of+qualitative+research+in+social+sciences PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc11c1a9f---nalenupekawolalukerase.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7de56d1c---dajod.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2c7434dc---bokitisunofexozoz.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/zutunifukuluxowupisibuni.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607518dd91c74---47604972480.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/dorafavifo.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nekaseb.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/39b2c21a607b361524836099f3f4d9bc/66654647466.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bofukidofil.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/betazabatoromegetugoneb.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/dizakanimetaj.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/148f8eedc42da54e25ac01d73ac634e7/soxepifizixuzosapabas.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/073b13cb64f6124419c428a917412b24/79169440068.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g6ns02e1ngu4q3vmboafp9gd8m/30739721177.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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 5376 bytes
SHA-256: 62c3e433488d5cd35050836d89050671c645462b652ca4405de395adf2e77239
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10392 bytes
SHA-256: 89cdb6f0bac93b8c13b5f67c39fae7a1bc12c57e5aef8cd3241ea86d5519726a

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