Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d3a9c8922e1e7f…

MALICIOUS

PDF

91.0 KB Created: 2021-08-08 13:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcd6d6a59e1aa4595ecff0c93cac43ba SHA-1: 80d4ff38be504c54a2bfb1ee203de9ca69f9ada6 SHA-256: f0d3a9c8922e1e7fc18aab56e3a06d97bdef06c51691fbbe62e01d4890162ea8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l7qdgqojhkr89tqm4iftar2l92/worikodikama.pdf In PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/tabupelasogo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a633c0c4f8b---87409713670.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210629_E7F3D7FFC1892C00.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/96779498940.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/66734439457.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/pidazi.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/16296416891.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d4501383---masopef.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/80275385070.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98b54bd35---8837548951.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/tufumerini.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/buronukerikekarusul.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb0b969bc---20418930739.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/7b30ee0732c5071040b9997b978a2f32/biviwilo.pdfIn PDF document text
    • https://majubesar.com/contents//files/kuxajubolawaranire.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/21cd77a213cdb9ef9fffb09360af55f7/tibixakinadujag.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210619135525_ggdhhd.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d425d10b---newegodapesevozivan.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7096e93cafb77367b2298ef2e85580d3/60316188049.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e80715bfb---38423346386.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753b602bd30---sakowibo.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/41823244225.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/af56941aa1457851c7949fbd86966c50/96891932864.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a993f64d5c---42721736260.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c92000e988d6e64afe9d719dcf11cf09/98804499284.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0fbaf114---13421282257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+burger+king+couponsPDF 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_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 18408 bytes
SHA-256: 7d6cb4dd73d5830e0b70ce4473671b68d6f50d7811ebd2dbe7e1552062249924
font_02_sfnt_off00014528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14528 10748 bytes
SHA-256: 67f658718e0a5a608163c0257d37639b0501f5e3476a6727b99abf51f8812d42