Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75d78165b2f618d…

MALICIOUS

PDF

74.3 KB Created: 2021-07-04 13:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40bf46014b41dbedc800ae3ce516724f SHA-1: 7e4d2b5dca5b0e344ca16030ef3ddc15b839fbe1 SHA-256: c75d78165b2f618d6ec50a11eea2f829d6cff72e904bd6f8c2827496d5801502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm' heuristic further supports the attack pattern of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=people+hate+me+quotes
    • http://munnarinfo.in/userfiles/file/98237453975.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-6-3/20210603125404497131.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3a9a2a22---48472502630.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae7dcec6---xevidafuvanixupude.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/eee85d1b109aa7575e6cb600375a0c8e/terojuzutajinadirubum.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/porupefuzegoloxad.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/61e8f7e4f7f6f5a8bd2595b8ad685e3c/32010913074.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5287d039bc---8415144337.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e50fd2930b59ec799c0d98deebc7bb92/nijafedipelewutoj.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160947fbc78772---17550516080.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607256f53f77f---96966517366.pdf
    • http://andlupa.com/userfiles/file/bugusudogasetibepovex.pdf
    • http://bkdesign.ee/userfiles/file/78399978833.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/fuxuxulujof.pdf
    • https://bloomeng.com/uploads/gosaw.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1d309d7---16736374040.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084465b8f907---48849761023.pdf
    • http://csc-0898.com/userfiles/file/20210607171842_6t1dzg.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076efceef474---xevaxakeminadu.pdf
    • http://messtores.ca/fck_user_files/file/86025740345.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b5dcf208f9cc6a8dbcd791fa5d157c71/20122965641.pdf
    • http://curry-box-deluxe.de/userfiles/file/23159635313.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5554dab824---kakozufajapugumivobe.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6147d1f1d---36204791321.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_off0000c0c2.bin
59b8c6eb4ea31b760e310d7129ff4e0c3302b1b9701bbae3bf0b6b893cff7766
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 10468 bytes
font_01_sfnt_off0000d89c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 16792 bytes
font_02_sfnt_off0000f0ae.bin
fa45801fb919442f7a8b40f5873af2befafcd8fab1b0e906894272a1d6b60019
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16924 bytes