Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b601f4e23d67fde…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 03:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd2597b7dbac9d485a2b5663827bd136 SHA-1: a03c52fbbaa8078646fc98d84f69b2c84bffd1a5 SHA-256: 9b601f4e23d67fde01aac73b39b87e29ed23fffc008c1f1d24cfd6821ded7b0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://systematix.pl/userfiles/file/vowemufadubalagu.pdf
    • https://shreenathtechnologies.com/userfiles/file/vumefedo.pdf
    • https://nabsangram.com/userfiles/file/jubajobijubufomevuge.pdf
    • https://miet.hu/kepek/63418983551.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/cd36bb028fdee8c35dcd8169531dd858/kafakobenefizojew.pdf
    • https://okazionche.com/files/51516503234.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/58860813705.pdf
    • http://jewfri.kr/files/image/files/81972474520.pdf
    • http://autohondl.cz/userfiles/file/49669618815.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j309ekd58cu3sasa8qk8t27miu/davumon.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/84714986863.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idgm851ejv3ne6oa60ev3bjvvf/gobatubemow.pdf
    • https://careersourceokaloosawalton.com/files/public/35909048110.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ea441915e---wunolebexerasepudonizenez.pdf
    • https://tecnibat.net/uploads/archivos/85099370990.pdf
    • http://ysenb.kr/board/file/editor/file/nurebotilefiluvadogesiz.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc668d4b6e6---82323114078.pdf
    • http://samtle.net/ckupload/files/sipojik.pdf
    • http://paitoonbox.com/userfiles/files/gikenuganenajaja.pdf
    • http://wawa757.com/uploads/files/muwakakekutaxute.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56ac003b5a68e0e0128beec792bde3d9/50907081320.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/37rhiplgj4h2421ti5vb9qovos/40873217680.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521b4dabe5---burarikotelin.pdf
    • http://gld-lining.com/user_img/files/ponipivuva.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/8319016090.pdf
    • http://congtyvima.com/images/Download/zixenumividugut.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/43292947801.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=electric+sex+christmas+story+quote
    • 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_off0000c48f.bin
a1e70bfe77be774720447e73c42e40b353a78a8ae43f160bf7a308bac590d35c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC48F 10836 bytes
font_01_sfnt_off0000dda3.bin
042dbba2a9813215ed932994c0265bed95fc8a2763a2e9286efa0bffb2bf5438
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 17268 bytes
font_02_sfnt_off00010977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 16792 bytes