Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c3b741d1971d85…

MALICIOUS

PDF

63.8 KB Created: 2021-07-15 16:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a39e6da5b509222e8fd17765163712d SHA-1: 889675ca7c59619400187977c16fdabf446d200c SHA-256: b9c3b741d1971d8584ea131c2f2de967ce6102456d2e36c45d15a7761cb027b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. The file's primary function appears to be acting as a link farm to distribute traffic to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7597

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://avigailpekelman.com/sites/default/files/file/talokereribojokaxunobum.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa85d9e7c---xerutuguxefa.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/pebejuwejumukugamipel.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/30341465702.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/pofanukowum.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4de042fe82---45312054503.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/pokig.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a5cb0fb9---jenurumefobiwuxiluzodoso.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xawaxepeduzupezum.pdfIn PDF document text
    • http://strandedtattoo.net/file/valututaluxopaxojaraz.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/zafobelu.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gedoduvovolexajasesepako.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/6930167813.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fazasil.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4741a490---73005187292.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/34113438478.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee93f8fa3c---20845128452.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/barupibifijaposanajipawe.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06f77d7a5---jufonazijefamowixulepadum.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72872834cc---21539097291.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa5ae6438---luralixojexidogajakiro.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c198338e578---lonuzopibugilaxojav.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4f08a8f6c65fea366d8da2deec41e412/zoxuxalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+bios+stand+forPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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