Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dae35ca6847f1a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-13 19:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed0a7e0370eb50a5d46512f870156b41 SHA-1: 788d051a46521eb86203a58d7e5ae65f44456d9d SHA-256: 76dae35ca6847f1a0b7adadb14e16001ca689ca41bb33cd227b29bc93d3c47a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://nesthomes.in/userfiles/file/70828730066.pdf
    • http://pijntherapie.be/uploads/files/70970483551.pdf
    • https://vgi-vn.vn/app/webroot/img/files/87654233661.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df39931bef---87929977449.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160753bc767356---xepilikowixajadapim.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ui9u3omtr4fes8odnoap11vktg/23564210985.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80e7504e0---34575143984.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ea8de434---95330313212.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/iml5h0inip4q9ffm4e7ijcfh7a/bodif.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59b63b23f---69439739542.pdf
    • http://medipharmacompany.com/userfiles/files/dubuwovidatanojat.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/50851864296.pdf
    • http://rzn-house.ru/upload/file/13295282127.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4amh0jl26cr0v7gp955bpmcqac/vuberonotepotugizose.pdf
    • http://allasclub.com/campannas/file/98252618722.pdf
    • https://isosklo.cz./uploads/21332617752.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/37b975ffc3086eb19a430d6f0ab2ce49/nusugifabanekije.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608255c1eb858---80319821858.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78240ebc66---bepiwi.pdf
    • http://www.aqsclimited.com/EditorImages/file/mibikulowig.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bc1de3a4f---90597542544.pdf
    • http://abwrva.com/uploads/files/30129011900.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b2baabdbc80b839493bbeb86001efb17/57772828309.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b77db61bc931778c87104dbc1731634e/kujepopitogomulivoluxulog.pdf
    • https://palcev.ru/userfiles/file/mavurojedojekibuzinaju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+a+rubber+band+gun+out+of+popsicle+sticks
    • 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_off0000fd71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
font_01_sfnt_off00011588.bin
a82815dfd93dabc070534cb4a7a975b25b9077313374b5543bab113904e01f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 11372 bytes
font_02_sfnt_off00012fe4.bin
4e79beef75d6fa29ba1dbaf66b198b8a4b2377c1585fffec436c5d8b4d5fee0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16996 bytes