Malicious PDF — malware analysis report

Static analysis result for SHA-256 df11ea8149c3fc13…

MALICIOUS

PDF

69.5 KB Created: 2021-08-18 16:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b9fadcfdf3b7984bc3772c0f4065567 SHA-1: 8a8b29a87cefe32ffa7a5d29f4fb1f532df817c3 SHA-256: df11ea8149c3fc13b492704a296dd20320a890b0958cb9124fff153f972d9736
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL patterns are strongly indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8982

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 https://krisoc.ru/uplcv?utm_term=how+to+set+up+a+walbro+carburetor PDF link annotation
    • http://booklandbooks.com/userfiles/file/8149147654.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/20652996810.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/83179629893.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/demalirepidid.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/timujebavakimuvowosopipik.pdfIn PDF document text
    • http://brukbet.com/user_images/file/ripafuzuzusaguz.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/76668298368.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1611588045b56e---2997036699.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gosekosodejejopexomibone.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/20722506721.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/zifide.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/85200594550.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/m1ld8ifav2d09a3re355gktmql/maxenisarakisawedozetuted.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/muzatejekuvi.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/11745219254.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b69f9e5---51112094989.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210704_82D68838B4E106CB.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dedbf044def---58902338977.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/48830728964.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qbcq1bh1kkfef9jqtp1d8cuvt8/sonavetijujugadewonafofu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfb532a6a---82851719948.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/falirumipugujavugifutemo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f08c77f5e---58059917999.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/19499583181.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92a26707a---fuxokofamer.pdfIn PDF document text
    • 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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 15980 bytes
SHA-256: fc1a7f2a4a90b85559259bdb7a75f2462e79381177f8ce8dc9513844aa44a36a

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