Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbdb194b59653f1…

MALICIOUS

PDF

71.8 KB Created: 2021-06-23 13:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e12f5a726f89e2d73b2d5db78b8e9fbf SHA-1: ed97f9f9d5e98aba7eb9dbddbafb556ed926db48 SHA-256: 5cbdb194b59653f14dfc1151b3eb71a0ffc80824901a32a5a9320ff7676dc6e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS upload storage. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute malicious content or conduct phishing by leveraging a variety of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a549e364b1ff06741a7eaeccb11d77d9/18811903859.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/l32407ucldi9ubgg5gqdhrjlh6/sogeve.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/70791976699.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/g7enldl1468cpoq4pjrkbvk1ri/varixetusuwoja.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/rusigavepevodewavurokesu.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/zowuvebekemedu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9rccqv6dd335gfkp5asa7rpls7/68465947089.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/zetigagezimifugatozugilol.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/91194587433.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b21d65b8---losasuzujetegupefotufiwaf.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082af2ed54fb---30429083880.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/33fcf3df36e3b9d5e2020620be6f1527/xujiwijavojeku.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xawubidudeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cheat+gta+lcsPDF link annotation
    • 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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 4868 bytes
SHA-256: a1f9960aba37be0c7711a6f6631d4a3c9f478bf782ac0560535d07ce91a0c5c8
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10352 bytes
SHA-256: ef2d57ef684b2018a94e6312eff5bafef50196ae424ee74238aa8d33502451a1

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