Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89f704f839c9ad7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 07:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f534b517a97f9218937ca295049b406 SHA-1: a6871d93e48ea53a46f5fb5c3b043f4803b4ae89 SHA-256: c89f704f839c9ad708ded2089b20050b31ff9a2b20c3d6f605739c613229ff05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://drafthe.ru/uplcv?utm_term=android+finance+apps PDF link annotation
    • https://jobtiara.com/files/files/paxabosipukojoloten.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/2491640329.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/rejasoxajedonutito.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uggdsrd0hsv719d764nfiha3v0/89235556380.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/besev.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e37b53216d8656e585bce40d018360b5/37520591736.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/64803632924.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/aa1c90b7fd5717b9e90be99f5bbe420f/7190660986.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/jenowagifoxunajivogis.pdfIn PDF document text
    • http://travellerisland.com/files/79955739065.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138bbad47010---nuletuvaxosusibi.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/ragemobapuku.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/2388400446.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/92738039899.pdfIn PDF document text
    • http://meskerjager.nl/media/files/11351843864.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/89054683858.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/jiwiwapu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/bomipamamol.pdfIn PDF document text
    • http://handgun.ee/media/file/51814972740.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae7a7f8be---45582588138.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/91997430463.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dawubenurodi.pdfIn PDF document text
    • https://domilot.com/uploader/files/puzanone.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/76517363720.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/1623631151.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_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10452 bytes
SHA-256: 0adfb77cdb62eea0761fc7a0f35599851c01eb2fea8b16d456a4de066b9afa11
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 17260 bytes
SHA-256: b91c2bcadbc11300713e37c5443edfe80686899db6b5712cf475dda7b924179d