Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55c4ff7c8a3a3a7…

MALICIOUS

PDF

78.7 KB Created: 2021-07-21 06:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92899be60f582fe47edb5ace773e776a SHA-1: 16d0a02a6e1a26f83664836556d7ef9197aa2e33 SHA-256: c55c4ff7c8a3a3a78df60da67aa51ffeedf3b34623dd0698227d662039fb7a27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to potentially malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/buf543tcqu45hkcndi70cmqdh2/12968650834.pdf In PDF document text
    • http://nagymester.com/userfiles/file/29932448232.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/55421333810.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081627aaaaeb---rojanejemilizowojef.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/da4105522830ae078209aff91d0874cc/xojegupifekebukorele.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/25/file/20210625_130231_135.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/zavimorari.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sfnjqeteboom5mu5qut8nocob0/vumuxa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088561d951d9---zosixirodam.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/78576909183.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecb64cc0e---junix.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/40324494942.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/jigojofoseture.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/rajubagutebunefoj.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/pojom.pdfIn PDF document text
    • http://orthopediedelft.eu/files/77116981135.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/92109830680.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kopapewixowuti.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db453e6ff0f---gefukijorekaferuni.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/22801691975.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd733a043---8635986233.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e705108fbc77a84e757482cd736d446d/pogukefiroxuzafitex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+bookmark+in+acrobatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10356 bytes
SHA-256: d697e0a644d10f52e7e6e24c286dd464b169ddd07b774d7ec937c2e9f753ca3c
font_02_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 17328 bytes
SHA-256: 3c113ae53f43d8437b7b40a51452cd9bf9dd475ec1f95439ab0ede27d7d1f735

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