Malicious PDF — malware analysis report

Static analysis result for SHA-256 279160b9ca93c1a5…

MALICIOUS

PDF

102.0 KB Created: 2021-07-19 12:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4c116302937e2524cff045b36295b96 SHA-1: 825330095a93d857492bfd501cb6aab3dc4b2cdd SHA-256: 279160b9ca93c1a5049683b84be5398a4dea2f393c28931ad8b39cf22eaf9b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often involves embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5fddf06b414ba14b2adab563ae1c4f65/vadaj.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d1c783cd---97697971149.pdf
    • https://bawwabatrizq.com/userfiles/file/22226895579.pdf
    • https://bibliothequeanglaise.org/upload/files/80866846393.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6f58c94---13667956937.pdf
    • https://alihuata.com/userfiles/file/kejuxinabebanubafafibov.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/vapesegikekonofufusoselel.pdf
    • http://ufnk.fr/app/webroot/files/file/95466633174.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2ee2f0424e745f830cd3fd478d9eb373/nofodulugun.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0d97e86c---11047150500.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/noxugemotazelewex.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8684sjj3kjvb1d0tuc1mqrttaq/kegoza.pdf
    • http://technoculture.cz/admin/upload/file/29174945641.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/rupexokagikabojufaxup.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160807e3d4c34f---kofakoj.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/87844ef40d333c910523f1580e206e88/timesiwisojixip.pdf
    • http://tasteofruraleurope.eu/upload/File/kapajalemosatitita.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6107d4669f---71025599497.pdf
    • https://agrimal.pl/userfiles/file/6119644438.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1653497553---55511175143.pdf
    • http://xiaohecollege.com/d/files/12254943367.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c556d9a3c078e23d0a4ba311c13c5bb3/befazunolekakev.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/453rb2ureoguoj2efqu32dhvnl/kujorozetinubufot.pdf
    • https://slide-bearing.com/d/files/doxamesidudijemoj.pdf
    • https://angelsforwarriors.org/userfiles/files/gikoxugakefofifizubewur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=another+word+for+news+story
    • 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_off00012c63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 16792 bytes
font_01_sfnt_off00014475.bin
4c620897f2facd5833d2b7a8e24bb993c89c9e1534bd66716e16e65e1c31390e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14475 17884 bytes
font_02_sfnt_off00017382.bin
08001be2c58b94c3fadafdd500786a97d368e9fb5106d213de1f4b39521ec626
pdf-font-stream PDF embedded font (sfnt) at offset 0x17382 10332 bytes