Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc5b1f3332399b8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 23:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3959da619a31844a5e3d3005615c6a38 SHA-1: 516934f5624aa083437ea811b72b4ffb802bc3b6 SHA-256: bdc5b1f3332399b8f148b8f6e4847ffda33620dd79e64b32c9dc7186f998b33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=jingle+bells+chords+guitar+pdf PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a828af78e79865ddf060ebbec68e586b/86024426870.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/vukotumes.pdfIn PDF document text
    • http://mosjob.ru/images/file/30697854812.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/14913711259.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060406322773499.pdfIn PDF document text
    • http://modern-pro.ru/files/file/50020923534.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/21bdb83a09caf9bba92e3f39b4747888/9512374516.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/n09un3it652d8fqg84cgn836v8/98450611296.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b050a614c3a---betikeg.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/08-28-08-36-50-45.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76dd1936f0---79661621761.pdfIn PDF document text
    • https://biocoils.com/img/file/ninidemarixudeb.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b270f3047---fagewupinenesurenozofuz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ret8im66it9udfn071ng5da5a8/wufawafazipoxumifo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4463aaf5c---mepuvafiju.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/jasojudi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2068ef1b0b973a9ed70d16f5a11dc9f2/77379326953.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4dcccc3e---8937173095.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e992686436ff2b1aa473f84c5000971c/60401251262.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cd81a3a649968f073e3e384cf73a5849/tonimemegiwebalov.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884ab1d0278---lidep.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089929aa8773---69597350382.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/71319597926.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/xiwuwilijotewutuvepir.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 11132 bytes
SHA-256: 74a8a5a5b75c757cfd2d03cf51dcfa7c647938ac7eb90c742c9b596d1e93e5cd
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 17692 bytes
SHA-256: 55917264cfc20e74f81d63d3f46fccaca0a86724b88fedef32b323934f147f18

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