Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bcaa5cba834991…

MALICIOUS

PDF

39.7 KB Created: 2021-06-26 23:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 9cf9fc82439482a1c33c9ed696e4dea5 SHA-1: 9c2e901582dc094b69a5c3acd3c6f3a796e5041c SHA-256: 10bcaa5cba8349910826684fc7e55fffcd998db33b9a1d8c35817fedd6661692
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 0.8579

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 39 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 https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e905372ef4---25591581138.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9571cde6fb7c769e7f5bc96ad03b7ad6/40230965337.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3e6dbc26ac1ffb927d8f96ae9d8e610a/pifinotepijulososutuga.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1843247981---37962342544.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/63eea8256df798026884762fc1ffa78e/mifujuzutemudotakib.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04f85c47d---muzuzejefefawebulogukoz.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/nuteloporazawupagelujine.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a10a286dc---dizavo.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/didajexetux.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c49ad1f8---28741737335.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/zaruvusivinotewero.pdfIn PDF document text
    • https://actorconseil.com/files/file/guderetisanobasekubefisi.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/mosapojaxej.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/27359945042.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe905afc6e---tubatoti.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1qk3aenar6np5c0jp36it5n006/janakujulujodolasoxij.pdfIn PDF document text
    • https://jdbailbonds.comIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fences+stage+playPDF link annotation

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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