Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bf97a5109acc45…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 20:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 914c93c8d69d6dafb0ff2f47b49eee00 SHA-1: 899d1b837d5a0fd40a2e2e6763d08cf43ce1c286 SHA-256: a4bf97a5109acc45a94d80a136b6f4234b463e996c68ac7359f346e45a950ea0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://worldnaturalfood.com/image/upload/File/ruzuv.pdf
    • http://charivne.info/images/file/65183972951.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d8f9d728ec05c8306f34c28c26ad6195/34112311241.pdf
    • http://roxburyhs1987.com/clients/63080/File/81294458227.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160972abe99aa5---vufenega.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mnudi3f7jf0hc6aiu573eudc7t/34561179698.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q3ucb9e8gk4a2knscbsv4666h0/89039208414.pdf
    • http://nct-vn.com/userfiles/file/91181346044.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2c3ce167a6f609fa34fd84633cb06fa6/66086735194.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4cb27cb8---wafipu.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/73840320676.pdf
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/45920047755.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/rqddcdb5j6edovfthf23p3on65/lagovebeko.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/mumofegekemokunepikij.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979acf0a8cd---85850724799.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cade51e---43451819224.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/26338476096.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bf0a4cf149dbe1eaeec77be0831bb035/80448367671.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/lufadewitadufa.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083785a465ee---93754351737.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/36905341977.pdf
    • http://texmet.pl/userimages/file/tipon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=is+parseltongue+real
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010830.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 16792 bytes
font_01_sfnt_off00012047.bin
72f4cba224ed3f3fb04669859f8e11f34365799dd768ac32d5790776fd0824c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10388 bytes
font_02_sfnt_off000137f7.bin
5a1e2499caf8447a2f0088cbe87bab62813a37826865fe8630ee131cae437a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 17048 bytes