Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c5fe297319607…

MALICIOUS

PDF

77.3 KB Created: 2021-06-26 04:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d30db1ec23f9cdd085fb1baecd778b7 SHA-1: 1efb8fe15657376dd181308d628a99ec8d4b5a75 SHA-256: 0b9c5fe2973196070c396a137874ceeeabddf1af5ab589a2ec32c64381cda985
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8939d425---medutanudirejeru.pdf
    • http://xboxheerlen.nl/userfiles/file/pisaz.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8d99de52---bimomiramejozezeko.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/ladexuvatigoxosakelo.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7s1q94hfdolgd8eqdof5u8ql4/48539848665.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd280b7e8---45785826664.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f309220a6d399fe00ded93bc2b5afbc6/40061185212.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828b5cc4f83---17301975437.pdf
    • http://www.ecvbrass.ch/user/web/file/64491001411.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/281f809160845a4610b621854302723f/30618901419.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/vopulufofolijifoguzuvudet.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d0939d2d---zajidinozutepatitivibo.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tneptesoimqq9cm32kd1rf0ikj/taposupudibo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f4fcc9d0201dc077bde6f1cdaba9f724/93397305053.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc024e07b2---19139086601.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6375e599f2504689e1e9adc97f293331/fimeken.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca0635975---mufazete.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=d%26d+5e+beasts+by+cr
    • 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_off0000d201.bin
9cb0400529468af003561a69648f00defd7ef46ed99e4a5de1ec48d92e20374c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 17092 bytes
font_01_sfnt_off0000fe72.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 9076 bytes
font_02_sfnt_off00011117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes