Malicious PDF — malware analysis report

Static analysis result for SHA-256 00876abfa785d969…

MALICIOUS

PDF

80.9 KB Created: 2021-05-06 12:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4db81c8578d841d0ca4ca91a3b4ae983 SHA-1: 18e7b5f6bd9415e9b3423d40c822c14c0d2e39cf SHA-256: 00876abfa785d969d679a150c4eb2921353b6b9ff5a6e7d7ce5c7bd8ece795f7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to external, potentially harmful, URLs.

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b2c79031b40b774c058cb98d911cdc39/30558836554.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2cd750152---xokejesag.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9p6otn2clmoegl7s5n080p373r/durujuf.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bcb24e30---34539929658.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/2fabeb2a235abdac5ba21c577052188a/muxamaresuw.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ca6a90a63f442b53b9d0fe4eb74b836b/73577532495.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079338f8545d---70644901330.pdf
    • https://amitadevnani.com/userfiles/file/77515270045.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/a3ttj1420evfua6m93co675r2u/wavavavovimuda.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4f0b035fccffb0f1301e8a90cbdf1e2d/2268588399.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5074d62bf89c9842824bb4df4bdfc53c/81234371532.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7d78246e---58133887970.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vcicgdb0j50reoe73tvsei4sc6/80372866991.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgn2urplmaoseitn9kamdg1dta/38173659791.pdf
    • http://adaviestransportltd.com/userfiles/file/80709802103.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/66e3d039a57a53fdbb1c23476b54427f/wosogujijowosidowagudov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fun+math+coloring+worksheets+for+middle+school
    • 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_off00010143.bin
8a3f9c4cce8ca2cc67af89aba9241b42511bb6dad21603ac241cadded6cbf6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 5548 bytes
font_01_sfnt_off00011406.bin
ca0f5a17667ed6d3708e559d4f63a7e00abf9556978d5e7dedef84c5615d2e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 10024 bytes

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