Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a5313012c3974c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-07 22:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b62a5438509aacac669db9a7a74d449c SHA-1: 8219b0e8bf426920c53450d215def306352e571b SHA-256: e8a5313012c3974ca3e310e4390653274304527d601bbc0cb50fd5646f967e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the overall structure strongly indicate an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=several+is+which+type+of+adjective
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/716bad56d5a13f1aa83b764fa8374d08/20455995751.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/9aaafe69e45d0cc88973514f445ffc8b/91505373395.pdf
    • http://eko-inwest.eu/upload/file/midubuf.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/075a3d127c7f2e4cbf88d9516fb4b894/namel.pdf
    • http://nwatchonline.net/userfiles/file/pepaxisarobok.pdf
    • http://school19-zav.ru/userfiles/file/79770440604.pdf
    • http://nova-auto.com/upload/poliviwisolobe.pdf
    • http://iehyun.com/editorupload/file/87735125486.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6871b4be9---57999381803.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/nakuxazoridelotemu.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b5a2e3d1---kogevulolakeji.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c732e191ae---zigatofavozepitim.pdf
    • http://mimarkamilozkartal.com/userfiles/files/radowusaj.pdf
    • https://medtek.vn/storage/file/67126494791.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/10eqkt6gn78101pk9uoj2lr1t2/juzilo.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/957243cdbd1c1793cb72bb512b3f2caa/vonizesutosibesanibew.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6fe21e98be0108e072db73eb58ac7b75/50182017472.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c24e8575f6b617afd72c8580e0d38900/ritodudib.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/h9dths71n6va8dm3v4f6n2o2go/gijiposisenago.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc351ec2b3e---nilirudir.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/efum9oojqg5hntiggv6vmmacjs/4926011427.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c95c1bebe---71635591045.pdf
    • http://sbs-group.co/userfiles/files/koxekesakapavoke.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_off0000f1a4.bin
dd93a1dd76ea4bc54623f1aa7f1ac794b5b3ecb17339838b095a2d6ad8f66865
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 18528 bytes
font_01_sfnt_off00012228.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
font_02_sfnt_off00013a3f.bin
5599b277ce5838a69f425a825045726712d9cc34887deb7e05058a844c01b4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 11084 bytes