Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a693de33bb868a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 23:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e5831bc13f7bb0a0fac2fedbd2f75d8 SHA-1: b5649bdef999edebfa1b23a7f3a1ec98ad12e335 SHA-256: f8a693de33bb868a1dd3ef2372ca64514eb2f150d296829ebb145f1132330f78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xo-sound.ru/userfiles/file/92522711470.pdf In PDF document text
    • http://metabolit.ru/files/file/31007309217.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a37072ab68ec2042c7894ba2cd717bb1/kuzafe.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/diramodavinakaniwu.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/vitigarurinepatevona.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16095c431b6751---lejeguxedifeganobosepesir.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e235d62c7fb---33887971152.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/sec2v640l0opf2en99pl5rbaaf/36283821613.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/fuzanererixosezekel.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/21132861178.pdfIn PDF document text
    • https://animaliadielisa.com/file/46392217601.pdfIn PDF document text
    • http://wohingltd.com/userfiles/8012307183.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/59211878148.pdfIn PDF document text
    • http://partnercable.hu/files/87426961191.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7c159e7d45e2bf8db0384ba05d531141/7008967244.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/16168647870.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/11396412510.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/wajamopoduzu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/filuxowibi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/79348506530.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/2483546941.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/67506999675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wind+energy+handbook+pdf+downloadPDF 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://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_off0000bb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB54 15796 bytes
SHA-256: bd3a866f606adf100558a30e371219006c3c051a16a6f28f0c2029cba9b8ecfb
font_01_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 10936 bytes
SHA-256: 985ee4dd23fac0298af52dcfdf7d7441490a8d89eb9a825975d04469c8651922
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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