Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd1258f18264b23…

MALICIOUS

PDF

40.0 KB Created: 2021-06-29 20:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3d56dd3e0175de59bc99bf35358e623a SHA-1: 40d4bdbad99e0b303238d9f53369b364aee7262b SHA-256: 9bd1258f18264b2372264df0df784f3739cfc00a824eefd2dbb93351480f08a9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8759

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://stolizstekla.ru/userfiles/file/zijumobupemeratapusom.pdf In PDF document text
    • http://ducthoaudio.com/upload/files/35869469611.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/90e4f35107ef28627e2356d42dbbb00c/sowafinalewedodolotafazi.pdfIn PDF document text
    • https://hirurgija.me//files/23651385677.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3592ca2b---bilixalope.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa301010c77---45109171367.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/i43s9qdna28ipkusq1keg8n892/87257999337.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/75320739686.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cf8cb78ee---jamozev.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b89ba4fa---95664540878.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac816c6df2---85702100590.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/876369472.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814a200cfb4---vuxoxeturexirugubafokaxi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a5a5447effebed22507569decc650776/50711252541.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/39301128645.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/bibokalarovo.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/bepuk.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3421b04147---24046107454.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=writing+center+ucsdPDF link annotation

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