Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f256c2a7f85bebd…

MALICIOUS

PDF

89.2 KB Created: 2021-08-03 11:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 093b2a69f0683a6917c94939a21a9db5 SHA-1: e9e5368f02d2cc6a75b44d8a37c0844b8ea80017 SHA-256: 4f256c2a7f85bebdb011db0f4bb3a8a9cbe0ee3ae7cd052ae8aa31b01d632e50
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but the heuristics indicate it functions as a link farm, likely to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2c01adc5041c2bb7db934539c7212b8e/90515248730.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5fe35285956a61c75178ad82c56cdda6/julix.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/57661529357.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b944aebe6---87877928579.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c940861878---60523520139.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1bcd917---26881585107.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/roxedulum.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/41509503776.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2f2b644e9c1a8da4ac6956390d1eac8b/7976173802.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/61491032359.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/49656843118.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/80334200615.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/luwefomebupimedavotud.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/didasewalinanuwurowam.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf27cf67e98---zefavoserenewapeniwumu.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/9914621998.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/65950775625.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609deabc0b0c0---rapibizezabo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/69f9b516bc87962e6b418915f03d7dd9/73548789225.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a302ce35f10---41691053250.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff85badf662---nevidizozobupajepojogex.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d1ccb57f57fd4de86ed873999358f94c/ragozuwerosisotowe.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b2c6aeae34e56fb5607bd465892c01c1/vefebowupekasosuzape.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/72a31f5e107a67164792d3c41682e7f7/ritet.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ab13de8d---zuginalebipademefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=politikal+na+pakikilahok+pdfPDF 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_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10288 bytes
SHA-256: 2cddb30ba57ebd743e985010437186f174cf2abda3660b029521be57dcfa0174
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 17420 bytes
SHA-256: bcd6d84c960990bdc62f798bec34b35b2014de7943457096207684b749140912
font_02_sfnt_off00013cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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