Malicious PDF — malware analysis report

Static analysis result for SHA-256 371071f6938f51c4…

MALICIOUS

PDF

89.5 KB Created: 2021-08-19 13:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bddbf13ee1bfa76db092570bb55d7210 SHA-1: 7a843ed47467fccbf58a9e35ffc9539d570f11dd SHA-256: 371071f6938f51c45ad142602fa1e08acc12af053d7592cc54640f316596bb93
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs likely lead to further stages of infection or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=vw+polo+mk4+workshop+manual+pdf PDF link annotation
    • https://restavracia02.com/userfiles/file/53101817841.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c9ba362e---97858134556.pdfPDF link annotation
    • https://topclassgardening.nl/images/file/vurunitidunugexisexanixat.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e6e7738b36fa2164fe499a5fa25567f5/85646618749.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/253b1cd3a4b0aa73081d990bf6d2bbab/62127533549.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0b5d70fdda1508d6dd6d57e1c49c02e3/katuk.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/12665099418.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/6586494580.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/zulede.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dee5cf8eeb2---lemetivuxediluwi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/ripepofozib.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1sl8943alh83pmk8vqlrsc1jbj/wixalagudulemasema.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/33871770598.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f89b1e1c72d33c107bad0cac81d558ba/vaxuzedifolidikifolidatu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/gikebugefasegugugepuwaf.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/rokewe.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7npumcedgksivsie3r93vjqi77/57284855570.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nusukirabelo.pdfIn PDF document text
    • http://midospa.com/upload/files/bozafimijevi.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/leped.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/74931140162.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/15345877994.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hs8am1sloovsu5a200vooe0uq7/6868722140.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/jaxefi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac412748f9e---bijejef.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_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 17856 bytes
SHA-256: db274b1dc367429a7ea1034594cb419d1420078ed34bf5ccb20771c5067f4e33
font_01_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 10768 bytes
SHA-256: 5c0d6c4c4506bb2b6bb30afb63c0fd4fbea7bd5dab00c3ebe72d668372aa7c07
font_02_sfnt_off00013f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1