Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f65a35e38853230…

MALICIOUS

PDF

100.2 KB Created: 2021-06-13 01:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6d494bb7259e373b00cf297fcbeddcb2 SHA-1: 63ed77729dc15fda5b05793291bb98c655bc67ac SHA-256: 5f65a35e3885323002fca27c7d9daf82ec957b30b62a78107bdc67cb745bbd38
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates potential tracking or SEO manipulation.

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://oniceh.ru/uplcv?utm_term=baal+veer+returns+full+episode+275 PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/aaec5f8b97c3846b365ddaed3a78f0fd/jileliwilorovarumaluxipes.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c67c40b7c---98910275177.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/fb17dc6978af5832d21ba02d25d2f8fd/86931515013.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/55461494824.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dv58pb8ot387bip64366oj7rl/gikadopuvamobomavabuxu.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/48729074540.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zefabeweru.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83d302108---latogas.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/197334802260a03975a6061.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5af22a21---46384408956.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3n9pvi5q4ncp7amgf484055bct/rujinatokotezaxunowitexi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/02c9c9b2eb024ad2d5b61342e747eed9/81612012432.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f70459078---visoruwerifoxizajekitore.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/aee71abb79c5457c9e120b22cfbf5ae7/78946806920.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0754677001620054863.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/wolunimifuviwulabawoxa.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_off00014b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7A 5480 bytes
SHA-256: 6d78af9ce90764ae08e1d42d728a7883e78e3fcec59a6420f352c3e9cae4d0ec
font_01_sfnt_off00015e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E42 10820 bytes
SHA-256: 0e8b0342842778fcd1b0295badc4d23b19ff351373301c6fe78e246d0fb79bd7