Malicious PDF — malware analysis report

Static analysis result for SHA-256 26be43b073bb32ac…

MALICIOUS

PDF

86.2 KB Created: 2021-08-31 20:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e0e044fa088da462fbe1212c333b8fe SHA-1: 5c496501a705436721a9b29caea3fa9f5ee7a363 SHA-256: 26be43b073bb32ac7c17dc04ef0b90d69c8c2dbbf0846b92d89cbdc8526893c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many hosted on compromised CMS platforms, suggesting it functions as a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/uefek8l36pv81ms4hfgahs2g75/29844895288.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8f964fb---bovor.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jutulasemomexuno.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a56ee6612---suput.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/momulupuribunurijonupufup.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a961497f588---duxunababo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/61058311235.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd787d5ef---51137272501.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5fbdf571468c2cbec3ea06cf9da8d2fe/23922381746.pdfIn PDF document text
    • http://gestmase.com/media/images/file/jefazojef.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/17131159047.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/turivosanexubob.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/wamon.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/37ef94368e33e84e5831fcb79b96a859/98386104239.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lexow.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16116e03321a4d---rupajuzokuta.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91c546c04---39815850131.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kgevhnp3deipn19diq7qrtsc2p/12162075793.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/88397733483.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/83737169702.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6a8290938bbb4b0003e2c1a5a3527392/wolisej.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc57443878---bufotita.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d32b2bd55e---sopolekulirowup.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/gipemewam.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/68232981113.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/xidaborivupukaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=meaning+of+incomprehensionPDF 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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10776 bytes
SHA-256: 61562aecb8ceb33c7955de0a8fba4c5acbf6a5595b94e2ab40b966ae0042fe58
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 20572 bytes
SHA-256: 0a4407e5e96766565e00aeaa258e4d590b77aca67ef7776acdb36c3f70cfd198

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