Malicious PDF — malware analysis report

Static analysis result for SHA-256 4debd7e69b8d8ed8…

MALICIOUS

PDF

97.5 KB Created: 2021-06-25 21:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa0a556b616c10df11b6c8a4226ff6a1 SHA-1: 260f1d1574f48e6e1edaa282975295cc16cc3b37 SHA-256: 4debd7e69b8d8ed8414bc5ad045e52f6aa37dfe40e3627bf4352f94ecd94bb1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the PDF acts as a link farm, directing users to numerous compromised or disposable hosting sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://driscollandgibson.com/images/edit_images/file/28978381338.pdf
    • http://aven.su/userfiles/file/97592088685.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/5022519867.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9126841cc---pizixowe.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def8c4538b---15073644869.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bcc58e1933d59f6a646880b79f027886/95461442113.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iu6e91f0fdgaodjcu8i0c441i1/pewibulesuzanakanasixobes.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/87gpcn43kc0joa0qko55troahc/61097222087.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/vinerulolamilipoxubataba.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/dd2cbe2c4fc981b189ea4cfc5354904d/33893275569.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2706e5d79---berunuxeniliweve.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfe28e1c7---87835262947.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd8d77e8e---57515430753.pdf
    • http://omg.su/upload/File/mirufara.pdf
    • https://jooli.ru/ckfinder/userfiles/files/71134484947.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90fc17dfe---66268310023.pdf
    • http://parfumkin.ru/files/files/42257072087.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff21f16104---67815382089.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb2bf5457c---vukilosito.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b997847cb13---71749429330.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cbe53783f2654a9c8df451c0db4b802e/4527369226.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/oo629k7m378se7urum91cs1e82/tukabironetezefupaxabise.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ee504d98225e108dc4972e8185615c1a/58826954402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=assembly+language+program+to+add+two+numbers+8085
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd2.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 16392 bytes
font_01_sfnt_off000112fb.bin
257706926c6a83594baa9bb9036892196da32f4205777d40fabb4778c2bac32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 18064 bytes
font_02_sfnt_off00014293.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14293 16792 bytes
font_03_sfnt_off00015aaa.bin
9a10fed8268cc489abf5b4cd9cb4f9c336a7b7694627a28a256eb534e22f3677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAA 11528 bytes

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