Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8964d74bf73bb4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 02:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ac014c67ed47eca5e3162607e8c3385 SHA-1: da0723eddd271c4226c3c123ef8661643b76a498 SHA-256: fa8964d74bf73bb44f565b9525cfbf2f61c86c148d6a5c2df5ff41ca37bcd203
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://c-amc.com/upload/files/7518412712.pdf In PDF document text
    • http://sky1981.com/asset/uploads/files/ziwonofoxomafutal.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/78291129130.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/15007233551.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/77561553325.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748ff30f5f---sawew.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/siwazivizijekuwuv.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e729d2accdd18bbcdffafb9d8bc0fb95/molelogalipofomubotog.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/48730747887.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/14933854547.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/miragij.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/93135973578.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/73371705241.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/kopew.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202194945507608.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/33940914549.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd440ec93f---zenobaxupureku.pdfIn PDF document text
    • http://szjg.hu/images/file/89804569835.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/dafilununosi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4250b5fckr11hhr7egttfap5db/86082717847.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b668381a26---46189689258.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn7k88gb15qnr3efl4obj3fr24/terunalesetirelabovukidad.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/betobitakewikopiwu.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/tokujojiwufevusuxoga.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381e274405e---tubatexagarudomurenidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=film+deadpool+3+full+moviePDF 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_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 16404 bytes
SHA-256: 790f89ccab03f03dd11d5329a6c4f41b02ec9c375c1ebd5fd819f72a047dda02
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 10504 bytes
SHA-256: a41090608161f2aa4dffd957bc74972b505a73e070c572a863bbbd45ab2ce2ff
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1