Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c9fec7aba21b3c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 00:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b9210868bcdf9ed5d3fa1ae694fbb63 SHA-1: a3b0bb4811a9dc3aef19bcffdeb7979564308f7f SHA-256: 86c9fec7aba21b3c3467c0a0cc097c220a080bcab79009f261fbb74fd6428623
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d4bbb58c490ba020aef605f3219f0549/55281339142.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/509869b41e0e6b059c0c59b08b7b9182/fapuli.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/volenumezovitelu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0eb23e6bdd637f11d5a8b696235a5328/gawisesudisawa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2a6adf7ad---22026708901.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/045ee124da9730d4d79128e5ca69ff80/wevuzetadiwibo.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/fubumilejuxepomitemux.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/61367197610.pdfIn PDF document text
    • https://capecoralliving.com/media/file/bataren.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192ee2fc42---jotifaginorexegufu.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/fatusuwoz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4f95c98e6---70057349653.pdfIn PDF document text
    • https://shidoremicrosys.com/media/859146419.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b4b08f11---96776441163.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161296e18756fc---32084580954.pdfPDF link annotation
    • http://kowel.com/ckfinder/userfiles/files/1622894660.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/8116695220.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/nomep.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/cc64b21c4b6f3ea47a59bf42c8858dac/29675825343.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf395043998---58811992479.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/52286042782.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/mudupafapaxamifimakoli.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b84424cc8---bawarepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=split+pages+from+pdf+online+freePDF 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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10916 bytes
SHA-256: 69cfc9be4bba276762ef6582f7a6363fbcfc583cbbee705bc812a5ff3b087495