Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f975e8dcd20b858…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 23:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b687b9c91bbb76571c1c6c515deb3d54 SHA-1: 6a7d5ad6b2eeb8a270eb4607fede1ccd5e926555 SHA-256: 9f975e8dcd20b858561b211b542fa691210f79a41fceb5f37e92c88e641629bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://crewmak.ru/uplcv?utm_term=cara+downgrade+os+android PDF link annotation
    • https://dailyhondaotomientay.com/upload/files/88463303578.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/74608359432.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/69199434350.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/rovamasenetulizabuwepiti.pdfIn PDF document text
    • https://trexanh.net/upload/files/48721781926.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386594b9e31---30013348671.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/8502771918.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jurajedegos.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/71997596817.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134643756cfc---20959791881.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/40642941558.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/tojazakaludetufipukasojat.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/918ebf630b493bd0b8c5dd67a180bc1a/70916983356.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/kawusedet.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/gabekalavibusagevig.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/tokaxejafif.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109021047386369.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vosob.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/27915283983.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/95344322094.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/46741839934.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/44982279350.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/65787948163.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/visipaforirududosenatikax.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/90283151725.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_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 19900 bytes
SHA-256: b0053e2f441b54744199283a53a04ca4175417ff8ac4cb1cb929736c02421368
font_01_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 10396 bytes
SHA-256: 5dad5fa193e59756a1cb8b9644a5ed37fcb859853f59d86008d0ad1b5f3e4447
font_02_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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