Malicious PDF — malware analysis report

Static analysis result for SHA-256 7400a84757079a4f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 19:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dba4d808c0e15a639504deed49527f7 SHA-1: b169a77dbbe3783b8150540fb09bd8da3fbada70 SHA-256: 7400a84757079a4fe1a26f703646f86924e393e9df5b282b4e95414f0b811132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=joji+malayalam+movie+online+watch
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd825649d3---88532169424.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/63670565192.pdf
    • https://veaodaibrahma.com/uploads/image/files/5298890062.pdf
    • http://xnucleus.com/members/member_images/files/48625248568.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbc75fa5a---30772136002.pdf
    • http://mevlanaasm.com/resimler/files/43849879610.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/81560592011.pdf
    • https://ncvpte.in/userfiles/file/bedame.pdf
    • http://thaifilmind.com/UserFiles/file/76427628785.pdf
    • http://gndpta.eu/news_objects/files/todetinasikopojelok.pdf
    • http://www.euro-fly.eu/userfiles/files/xuguvijorepogakox.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/taxupafi.pdf
    • http://hagelkonzept.de/userfiles/file/15274788149.pdf
    • https://chataigne-cevennes.fr/imgs/files/78080434926.pdf
    • http://wxeina.com/userfiles/files/17969704960.pdf
    • http://highgaincomposites.com/img/file/20219818933.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/blcpc1g0t1nb011uo6ft656c13/posutorujoroj.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/ziterosogugezorojejumupe.pdf
    • http://chokmanee.com/userfiles/file/surudamekaxi.pdf
    • https://songhongresort.com/img/files/29350162786.pdf
    • https://toppelletmachine.com/d/files/46592555613.pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/77183414861.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_off0000e219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 16792 bytes
font_01_sfnt_off0000fa2b.bin
6a0a2c701df1ff250e00fe3c5a04060265a97289708bc8abc13a8f7b2535f2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 17332 bytes
font_02_sfnt_off0001273b.bin
1f6ee5886888965efef1b8fb3c4ce603ac28dc589d39fe085855d84199023ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 10612 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.