Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a32da5c73f7669…

MALICIOUS

PDF

69.3 KB Created: 2021-05-09 15:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac73235f318c3f2f7a534b0295864195 SHA-1: 04aa107ef809abcbc469bbff8ec3508a1e7d3aaa SHA-256: a5a32da5c73f7669dd3564b36e99c173744b44cd842df668fc4c86894623dc6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'isobars and air pressure worksheet answers', likely designed to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9701

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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e093b8ff9f---90766442011.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084be1d27a0e---39346701470.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160936bc8baed7---83528203862.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b1573f253694424dc4853e7f654a2e2f/75640209213.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056bb732c9---wevafonixavoxinaj.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e1342b79---jufojilavexufomopiwu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079893059d94---webarimotumoj.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/f7721d2df80d1c00bbe15a9670ea6e0d/zilagajekitonam.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/f2h6pneq8b651f0oabbkigohn5/21647248433.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56fa9e0e4---13982943756.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b997146d8c---84403999470.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f5b1a4a04c5d162beef159bfd025e597/67461005959.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ce1adb87e9c78b9df8383a02de16e2a2/purizozozipubenutef.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7b324e2a---visufafetebovaruwusimo.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d9efb73---xudibotutiritojujizim.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160775191ee3bb---zafaj.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sjt7obojpkc9l25uv5j3nfgb9p/fupujuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=isobars+and+air+pressure+worksheet+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e094.bin
dddb7b3165e68c9e489f26753b85327e1015bef432f4fcc76ed916385b95ee40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5248 bytes
font_01_sfnt_off0000f273.bin
c02ceb5c76bfbf98c6737fc13d934ae7a6fbdd31bcbe3875102e27d8dc46df36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 9940 bytes

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