Malicious PDF — malware analysis report

Static analysis result for SHA-256 e184b623abf7db94…

MALICIOUS

PDF

72.5 KB Created: 2021-06-07 20:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb5853ea3aa7ba50f428cee838baa506 SHA-1: 4d6ded9bb370df948229b5851b11cd93f0bebe5b SHA-256: e184b623abf7db945be089165c8ce565c76c69a6add032d48a585bdf7f8b32ca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'evaluation' and 'numbers', likely a lure to encourage users to click the embedded links.

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://crewmak.ru/uplcv?utm_term=evaluation+comparer+ranger+encadrer+des+nombres+ce2
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607529f78fc67---bituxefagevikebusenele.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e968d4746---dogavazunakufu.pdf
    • http://www.toptehnik.si/images/34815896305.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8c0f35866011af8da94a19d2f0d8829c/wolakeroperibuma.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0c736e29653dc64e552ff090570294f6/malamexasazos.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f2122955c9d230af8d379d33f24fb3cc/39436568161.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba47ec5224---wadixek.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8c76ae233dcded1552c9ad2e327634c7/puwev.pdf
    • https://aduanaldelvalle.com/userfiles/file/buwifa.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768c496216c---saropavusatimomotiful.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8o1mmbbf7h6ulfaamt1hkonq30/piturupivadurubu.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4ee98457b5e82c25f8538c0e8fc6818f/jafigijotiri.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a431acdaa7f---goxabefesesov.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_off0000db0a.bin
34692036c028ece2b3e3453ecaf0404838db77a8e4e9fd5fb055f79c1abe2e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 5684 bytes
font_01_sfnt_off0000ee51.bin
6462616f59cdc45011b9d4623bbd78af6e8877866c9611ebc0ef5947d9b32979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 11144 bytes

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