Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6193a0c3f97c93b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 01:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ca4a38018b9f22b2c92a9adc63225903 SHA-1: f985169548492b252e863a378f1035ecc05feb6e SHA-256: d6193a0c3f97c93bf5fe8f149a992aba48ba731f5cb7b3f82c3eb1cc0fc555b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware hosting sites. The presence of external URIs and link farms on disposable hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=zoom+micro+rhythmtrak+mrt-3b+manual PDF link annotation
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4434a8c2c---xizuxewunurovosa.pdfIn PDF document text
    • https://t2sc.me/userfiles/gifuwirakofaxetomanolivat.pdfIn PDF document text
    • https://faprosid.com/file/19914088760.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3n4tmq5dt89sac5amh6to3bf44/saxutap.pdfIn PDF document text
    • https://premiersuli.hu/files/files/86001500779.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39624c7a23---46305792817.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43a53a1da---32612466352.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0e71deeacc---kamatisuk.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/u0o992idt42sem5csl7es3hj9h/67213878853.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/wowimuloxofomi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/72077162302.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/vuxolapomevukafa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad59840b07---zuwavowugufogefo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5631452b---wiwabawag.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/af9628fe6f5b7dd47769659da9c2bcb9/zapodakuse.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/gifepibijubexovurefoze.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/74109732031.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c8ce5e0b---bovagubijav.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/tugorumadopewimew.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59434b22b5---pukobigowoxamizobaxen.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2363238a119293899d1c5d9414a55d82/leramozifetisujezosito.pdfIn PDF document text
    • http://identik.hu/editor_up/gutirulipozir.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/57688802834.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/gofokazewofadow.pdfIn PDF document text
    • 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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 10808 bytes
SHA-256: bd98869d26d9fffbbd5678d8c1d2419dae557cb6bf1b8baf5d1c15ab3c58c07d
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 17140 bytes
SHA-256: ee64c9837551b91bf79a9f6af294dc43250867592f389e577cab74c54c31a086

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