Malicious PDF — malware analysis report

Static analysis result for SHA-256 46df59ae4b9b4fcd…

MALICIOUS

PDF

65.0 KB Created: 2021-06-01 15:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f35021059fb590cc7d084fdddb83acbc SHA-1: 4a7c4b0d825f6b85ac3e7249680a7a706c6a65b7 SHA-256: 46df59ae4b9b4fcd85ebc2317d4cf7b7ef7153d145b5ed391b2818420d7c0103
156 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing and trojan. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, contains text related to movie downloads, which is a common lure for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=heroes+full+movie+download+in+hindi
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qfd8b3qdj7j189s0q0ssuoe046/54274429970.pdf
    • http://apvn.info/userfiles/file/belub.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd89de784c---zedurad.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160727f1329f4c---bitagidomokarazulamubevu.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h5h9fdv6pmeddvamh0l9bss141/18381387940.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59840e6df3---nubusoxenadiwabugorow.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a529b0ee8340f8f9801e0f9d8d88f20e/38816723312.pdf
    • http://asokmontridental.com/userfiles/file/dekowo.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939716ccf4---dipovinodujijorozew.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c970584c13e022e5b54503120d078e98/wujojujoxixotugor.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dada3abb2f---37052188045.pdf
    • http://vladjurnalist.ru/archive/file/31928346975.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d933be58ad---xofuvabosuvebunolifenubi.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160777af219d34---raremabigogaxafibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c31a.bin
d5b00bb28768dc40f68e31291cbf3e9eca7d6d0c21d85d08ab978991f10fe4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 5260 bytes
font_01_sfnt_off0000d4de.bin
594e33ceb1898f51fb1ba640b9276cdab8476609e40b5c71f12df38aea216dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 10148 bytes

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