Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64db1b812ebe530…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 21:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 621eccdbe6e7dfd606178b7f6e15a529 SHA-1: fe31c8d24ba801a6a68a31d87a57508b6b599215 SHA-256: c64db1b812ebe530cfb5bee00cce2c8ec2064c0b6dd8db399600f6ad905eb1c8
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2c4a84b9---muvejixixamuzipamejufis.pdf In PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/48606222662.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/27255309111.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/vetugokobogikol.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/58060652437.pdfIn PDF document text
    • http://shosholoza.de/file/sudared.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b893089634f---jonezutidopazifegigigeb.pdfIn PDF document text
    • http://mcutech.net/files/1227388411.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16272463036179.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/81022803218.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5ef7d37e6---donigidozelisawe.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/76167634954.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/lu58hjt4ot3ko2candqlg311df/34974703898.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/dimakazodo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb411b290c---91372974076.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pisuvabinutenifapaxeximab.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b6189cc3---gider.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fded55acbd9---reragiw.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa26303f58---fotalobumesem.pdfIn PDF document text
    • https://palet-school.com/files/files/53460080896.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac096ccf51a---2933012719.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/rumutixaga.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/304601206b63902edc881a6eb06017f2/dugarozisixapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=avent+manual+breast+pump+canadaPDF link annotation
    • 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_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 10748 bytes
SHA-256: 74265bc43348e92db1fba0b1e2316e31af443c6c0fe852afd9d876eee039a436
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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