Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b55c032c4779a89…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 04:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f234b960a584f90ab8c0f0617630e7f SHA-1: 6e7c12c52311b950b6cd3b167789a16c689489af SHA-256: 6b55c032c4779a89d5435be2212ccea4d5e259cef18f2c1e55bd5464925029c2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The PDF document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL targets suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://tecsun-moscow.ru/docs/file/30666443.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe461dab7---zudok.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/funukamafogatakufupamag.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b88078e6---33111007738.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/25102780516.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/iapsj0v6gphnmhevaalu85stnd/guwujiwibadapolupino.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070624eb3ea0---96041298632.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/vovimuvagajoger.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8c683f8399d16d1cee704135e55a1ba8/87295382974.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/vewodopaxidozugu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/aba8b7ced4aea4af217ed6bf902f7257/46621577866.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/labazo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160746601b2e41---gemusuguxatugibuneg.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ba3ab1035419f8fb70e908d0a636ffc0/86735504043.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pobegedolozejabiwuxax.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf026c5e2123d6d89a4128d1140b7a66/zezepawogamuzuzirisizuv.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/97573741800.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/vimojusewotaresadanazu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mimd76n5inrhk6ihkhf4mkjk20/pizogulanepevixunuzox.pdfIn PDF document text
    • http://getem.plfiles/file/xirini.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/51861343982.pdfIn PDF document text
    • https://activepymes.com/pub/file/39587488328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=scriptures+on+physical+painPDF 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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 16516 bytes
SHA-256: affa9ac6d182316904cf4a242b6901979609524e983117a0c015859d884f6686
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 10760 bytes
SHA-256: 9973fba4570d0abe071e4003829658565f3fab9361a7c9862ed7c7f6eead02d6

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