Malicious PDF — malware analysis report

Static analysis result for SHA-256 121a0e11fbe759c3…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 18:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aafbf9915453d7be55730e8916c9952d SHA-1: 2d6943bdd22b71daeea8eea5ec73cf6d191d9503 SHA-256: 121a0e11fbe759c36682afc587bc836084233da46c288128806aa6ddc1048b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/303us77ce9ocjd7n6nicv34su0/zoxakufabawiz.pdf
    • http://podlahypilat.cz/admin/file/mewemodozaxiwudavososide.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4ec70a603db9898cff3f479cfa26ceea/pomebutivemi.pdf
    • https://groupunsur1.com/contents//files/bakufoboginafufonusoj.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7bbd352c---kusab.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/sadekixunaxodoguk.pdf
    • https://badoza.net/userfiles/file/xonanovasevezebukikog.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcae81f0c7---79882356028.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f800bdac---fimetadidodazukos.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/ruruxekizotif.pdf
    • http://maility.pl_adresuserfiles/file/wolemuxo.pdf
    • https://baxsporthorses.com/userfiles/file/nogafaz.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847828a6a33---lunuvakasunilesepo.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f589fb484cb88d84c96a4701c7e188c9/99094934297.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/k2u6jahd1v24ndf2mvo616nsfq/8017434934.pdf
    • https://matfplayer.com/calisma2/files/uploads/wajorasezetajesozefe.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1a3c37ea490a7ea6e45e9c82cddf1612/newufamopumefonorimuxusaw.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609494c98c657---kujonusa.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c917bbec57---sewomekawejatulomozugasud.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0263e70fce---xuxoj.pdf
    • http://robalton.es/Albums/images/file///wakosakigotakiwebux.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67267f99b8005e185f58adab0799880b/61016722605.pdf
    • http://turar-mussin.com/userfiles/File/17384132163.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8pk2ag95mi0oekbkki1onk1295/labewusopulakipididiniw.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v517su43hsm926ut30bfasismk/52533903663.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09a3c2377---kubebilafipoxezixa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=projectiles+questions+and+answers+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_off000108aa.bin
c93ede06ef8f9b416ffe4d78ae17bc50c30d39542e9e452de5aed5b74fc73453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 11076 bytes
font_01_sfnt_off00012268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 16792 bytes
font_02_sfnt_off00013a7a.bin
522e578db06f418869b6a6e87524ecdc94848b82b93b8a3068b5c40224a85c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7A 17452 bytes

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