Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a702a9fe4c67845…

MALICIOUS

PDF

72.2 KB Created: 2021-06-02 22:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960b0086a5a543110edf4470d1ccb227 SHA-1: afdac09a2806c4eecf73b5341f34cd009dcb03bd SHA-256: 9a702a9fe4c67845a1acfa8475260602db44f93a736a7cba9053126a507671db
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to identifying cast iron skillets, a common tactic for disguising malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/87g957hte5ccpdsptj27qmd022/66412793373.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6ukkvk8h07m781scb3l7k5r6q/tafegu.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/80408fae9c983b51e4bb6af042c9ca98/26016205379.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a1294b1f---75644964791.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61bdb8534---tegejozob.pdf
    • http://unseenadventure.com/userfiles/file/vemafavomim.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869b181bc0---58932426352.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ub9779tnd88r985an95tamqobf/xelanofifem.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeacac42ca---22582067880.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c0abe508---60083280938.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23919a0674---nijubebonozukazat.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/982f059793e0df38439f6186451d6827/13632008731.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/fda19f9178ca2cd026293bacb3596570/85977576410.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc7d488a3---72986503634.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9i1pn69gcmhmtgimcbop93djm5/43108184684.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4cbab645---paxibuvowiwulunupinepazax.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0e86d0d9fade7fe11724807f38216a0d/708209523.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6acdtdjg84g78r00o2akjm0k42/55847923068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+identify+old+cast+iron+skillet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfe.bin
b6926a8652df0f7fc6a5cbb18d140dba111748f0445c4e5600da588f0f9b2190
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 5236 bytes
font_01_sfnt_off0000eff6.bin
ce291bd3f97d2cc75ea2c7b6b2557a8ebba6a238c985416b7084dff6031087e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10280 bytes