Malicious PDF — malware analysis report

Static analysis result for SHA-256 a854c5db881b9f3d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 06:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca147c2862deff3c2e28d4f0468cd31a SHA-1: c5d02cd72ddc04f5d5f4f5158c33a341acc1d2d7 SHA-256: a854c5db881b9f3d32d6283fd12009a3d260a33fa1ae457aa81bea6d9c410b82
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure suggests it's intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://oniceh.ru/uplcv?utm_term=live+nettv+update PDF link annotation
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/53609183300.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/kojesokubitesagez.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/92842194547.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/marepe.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/98284026855.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/96245205204.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/misaxize.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/663f084f07f80970ddb96e73ac7f52a0/63307383696.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/sosorubazaxixisunixiv.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/66750927083.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/snv90hvaajlh5fbk81hqg4s8a0/81454696215.pdfIn PDF document text
    • https://ip-pharma.net/data/files/xeruk.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/zipavasumakelejusogovu.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/rugexepemud.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fanofo.pdfIn PDF document text
    • http://chayka-svg.ru/files/21745645050.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/farowiveti.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1takrd07pqknti75rkhlf5110g/15650823847.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/fojul.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/96850276479.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/penonuzodisivodoneraw.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/pobaxadufa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/75541122674.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7eb146a9dada1051c82723d25975a8e4/43796102899.pdfIn PDF document text
    • 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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 18688 bytes
SHA-256: bf9109e0d2473ac17e7d7a9e5fc0be183b165ea70f190bf3c6d2234566cf67b0
font_01_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1