Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdcf768c793ab99…

MALICIOUS

PDF

72.4 KB Created: 2021-06-08 13:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e4895e45ca1eab78f344fbdf2db9ea SHA-1: 58647b4a0bf811d8aacb6f51b33bd310cfb89968 SHA-256: dcdcf768c793ab99e173306654cd015a9ac8e6c03273e1a96499f7b0d440d863
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 WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://allytemp.ru/uplcv?utm_term=cs8591+computer+networks+mcq+questions+and+answers
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44dc412eff---kuwepaporudopipeto.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/89s3t0hbasfajtmbuaoomtefe1/77096426909.pdf
    • https://hohsingfiber.com/ufiles/files/vikojolotuzinije.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ee3027d4---52971854906.pdf
    • http://stasta.com/userfiles/file/59684952320.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26912380cb---29934440816.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944a5792e0d---40698621860.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437682a585---46746770491.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6d7295087e8302c0de31533fa6db5eb1/81762830294.pdf
    • https://indobaliart.com/sitefiles/file/84962957268.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791a3166cb---19705639932.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/14890e8e31fd480b1b37e59d8252cab4/35171005928.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b9f3bf49---43107693218.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b490b4b42c6---relisoligalurilanumopa.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301f3b1ade---89876584809.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_off0000d9fe.bin
e86218484966f23e501ffda04f7d471799421dd55f32222cc68b7bf7d9262e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 5900 bytes
font_01_sfnt_off0000ee19.bin
38edb17b109153687cc71b4c6b104acfc715162d0a97b77063c646eb3990206b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 11560 bytes

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