Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec788d8f51661e0f…

MALICIOUS

PDF

93.7 KB Created: 2021-07-21 22:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d76b1de23faab9773b8b616dbf4a0e7a SHA-1: 0dded0ca92d228c74f5285753cbd9c170c21b3b8 SHA-256: ec788d8f51661e0fa49e864a1b3f9d75d4addb9bdc0f32e868065d01606c4909
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8770

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094867daaec4---ranogesojurijepuw.pdf In PDF document text
    • http://norilskgu.ru/userfiles/file/23856795036.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8ec626ea5---dunerepakiduj.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe5a0c715---29877496729.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/82076308722.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a6c2893d---powegewopapux.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/fcl2kspig31tt7nvqdkmmdhu5n/wuvitinoxosev.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/latawenipeloteritumofofu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1764f1c89012137bb81dac868a5879ce/selosabesanaw.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/tapesezurewolibelaxulare.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kuwabudi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wokotugev.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pj0mbo7dp98k647ft65cf4l4c7/zowonugiv.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e10bf3eb72---xetamakugebiwolifabeja.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/20646474146.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608587f00b83a---10161569106.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/70855893262.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/a95vg6qrbsuuh5bbug5i735oe4/fubatojurovogo.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/lajoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+10+most+dangerous+animals+in+the+worldPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 11160 bytes
SHA-256: 771140aca9ed11207eb1110c0945ae2c56309565e47218111041c63634b70f9f
font_01_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAF 16816 bytes
SHA-256: 24be7f6937a73da42dd5490352b86e98c59b41e5af90c6a79fcaed490ee46fad

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