Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb4b636b0b416a5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 05:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5840b492e4d7cb7ec35bf5ef11b47b4 SHA-1: e990f18d9368c4b323ba7895eff3185d49501187 SHA-256: 7eb4b636b0b416a5209bfe1e4548b020a61152cc0ea8d6124d861d9bc4c1ca00
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 redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://oniceh.ru/uplcv?utm_term=mosin+nagant+for+sale+near+me
    • https://atrax.eu/userfiles/file/64742350612.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c460ebb158d---22970664954.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adde42db7d0---71265736764.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jvcog5ue9jcqpf1jud0os59spi/nafif.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210614_A011E0DE397408DC.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/niwapokoxosogopizesum.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7cc27ce7d---70695409443.pdf
    • http://fkjz.cn/upload/files/2021/06/202106260958586956.pdf
    • https://cvzona.lt/resources/img/files/memidatupiwifijoladafat.pdf
    • http://cuacongtudongbinhduong.com/upload/files/farisisibuwoseb.pdf
    • http://blbr365.com/userfiles/file/1628118577.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/20168966687.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e0220d2a---68133458025.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/61128684703.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/87324268804.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b0c49556150266516b7d692bd4851b62/xerurizerimazaxotutiji.pdf
    • https://emmaushuis.org/pages/57377792740.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607119681a18e---fowekufotufegobolove.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4fdls85iarr29atvsk6gf41eiu/22570449013.pdf
    • http://creptiles.dk/userfiles/file/70883550184.pdf
    • https://bititechnika.com/uploads/file/bumesabebevilug.pdf
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/91334988984.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/medisediwuxuxezidu.pdf
    • https://nieruchomoscikomercyjne.co/files/file/86896430618.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca1a.bin
a00a0c294c77b37aab9827e91e2f7034072264a8db8cf21e2a38c406d271c066
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 18204 bytes
font_01_sfnt_off0000e69d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 16792 bytes
font_02_sfnt_off0000feaf.bin
dfb8665d7ad754b77838b60e0a15a5a843d5957f5d8488ffebdafb9fca294949
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 19148 bytes
font_03_sfnt_off000130a4.bin
73864b51497be539e029757a94437b04ebda789f3b897eb23d2924148630b9db
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 10548 bytes