Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d11de7131091b8a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bad3c4f101bfe50a12143913093d1e5 SHA-1: a9a33ea490e7435f38c61e598f9d5dccca18062e SHA-256: 9d11de7131091b8a022b4b264f55934774148ea976439c2512611d6f1e589920
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links pointing to various websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://sochi-polyana.com/ckfinder/userfiles/files/4444970664.pdf In PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/wulixivokibomigefizix.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/xedagosevexofejef.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/palita.pdfIn PDF document text
    • http://df-foundry.net/d/files/musetar.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/wesaxoxexebud.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/96380120505.pdfIn PDF document text
    • https://faceless.me/userfiles/files/runidebudojiruwogafuv.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/kemimamugopamezaresimow.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/36194906723.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kndsq2gucujjclid8a0clp3uu0/resun.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e697621440b---vosolavazanupoluwujinuda.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/59394814052.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/pikelibowusoxosimomuwowok.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f274209022---98774287673.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/vnusald0ton7cmfv1t4nc5qmbi/80228179442.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a271af84a8e---nekezefazitoxe.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de96e1cb4---27112880373.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/pimugolimomogujot.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/dabezejafol.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7eb3f1a1d0b1852d406a633fe3af88fd/53111481796.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/boxizexoror.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/64235818702.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fecf9de1e---72542918116.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd0221a928---waloxukizexuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=syndicate+bank+deposit+slip+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 17752 bytes
SHA-256: 927ba4824bf1223184ecd78c9de664048f9305ddb1b2a358fc6a2729ff1e6274
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10936 bytes
SHA-256: 3bd6d9fa226476b8361350f8091a04b0843e5f76d29663ba98c1a8e0efee8b13