Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ef9eff963f5938…

MALICIOUS

PDF

87.7 KB Created: 2021-07-09 17:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f71040add41cd32ff288fb02f8d56413 SHA-1: ed2241e6a5e71d22c1ad0a55d53a57ac0f4569a6 SHA-256: c8ef9eff963f5938ff85f2feb526b1be61c7a0e63df6a59fab922ec4c14f96c6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/41280131311.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cf5e266155c986bb3327eadfb2328952/zaliludipewegekusojud.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/47513900088.pdf
    • http://cipetbhopal.com/webimg/files/181399948.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/toromojowod.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/bccbdc235aedd8bc1f66e3731caff632/tufigizokigadedupekumen.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0bdscua16rd0gnoektag7tamk4/11239704489.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c4604afe---noguworuvuvitobisepuro.pdf
    • https://damsindia.org/admin/uploads/file/dagepadujekeneb.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e676342d9e---fefan.pdf
    • http://tipiland.net/upload/file/85417251312.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aeb1b55a5---44056196165.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b469a5478fb---paredewadakafelax.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/65510064023.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080262ef43---fewuvamezaj.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/723f5fbd763a8b319670635b48013a41/92675564856.pdf
    • http://www.tekkoo.net/images/library/File/dokini.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/aceaj5a5vepv9toc5h1ro4k04l/67012628025.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/82664106713.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084007c5edfa---jexixipoleminegikixike.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/86980648987.pdf
    • http://inarchengineering.it/userfiles/files/pakidesevumufatoje.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be074354f4c---xinukimekokotoledaj.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7023f4bcd247c33d958c604925c1ff5e/5466652316.pdf
    • http://exosushi.com/uploads/files/15313622876.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=accounting+research+proposal+sample+pdf
    • 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_off0000f28a.bin
2d0ba9cd0565a6759d516d2a9a15aa3cb23a5fce640fb9c1bf34720dbfeec817
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 17360 bytes
font_01_sfnt_off00011f84.bin
00a56240e3abacd749ea57b1a47953ee03f54338fd4077b303021203c11003be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 11148 bytes
font_02_sfnt_off00013932.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13932 16792 bytes