Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6c9aa6b7e4fe82…

MALICIOUS

PDF

68.8 KB Created: 2021-05-17 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26cdb666007e8fcb87259f71b70a2984 SHA-1: 45baece891c325b527aa4aecadd8cbdb4a8db566 SHA-256: df6c9aa6b7e4fe82a2f092f4490fc0b59dfd09f88ed7c2a35bd3372b0df04403
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'square roots worksheet kuta', indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c8e4a82d---vutazizu.pdf
    • https://pypconsultores.mx/userfiles/file/42162119964.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/44496035fa8e767a98c00d88c16d6dd7/wusuwomuwazevebopeladu.pdf
    • http://bettynblue.com/upload/fck_img/20210508/file/25230318898.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6d298a5bf56762c86e078e3abb79abe0/kozuxogibixuwarisulo.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d05f1b103ea41b1d99cac2168d6f51f8/94121063112.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6601a646639ce86bc43db5a365ea8347/35097379909.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3a2f6bf88796aace5ffab448ff67cc22/28715475522.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/11hvol3cr8ah8icd6k1lc4ekqj/roxixezawitedevetimu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b360ce283---87868556793.pdf
    • http://kibbkw.com/uploads/file/9971923838.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078144ad0541---fiwisewutifuvozoforatal.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/68po4s5j49pit8k6tdirecvpmf/29842634861.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9498aaf59---vosotamujegixivafuvopila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=square+roots+worksheet+kuta
    • 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_off0000cf5d.bin
682022374941daed0c088f1896ed8166b25cacf9852b609cb338cbc220d8298b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 5124 bytes
font_01_sfnt_off0000e0db.bin
3c81a387d5a81c5ad9cd0b0fbb7dc647bd3f0c4a60135e1c6e3b505c9fbd1e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10564 bytes

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