Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a778b8cc8dc7714…

MALICIOUS

PDF

95.6 KB Created: 2021-06-26 19:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fbf2b9d9c100006c1656b3da5a61d66 SHA-1: d8e6e5a3661ba4a95494493781ad9b563c2be876 SHA-256: 7a778b8cc8dc7714a50beb927b8b47f26213ad1e02726a3fc0bf0380f4ac0bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to potentially malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pixomot.ru/uplcv?utm_term=the+lazy+song+sheet+music
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vjgkerfvc842pbttr3nht9nite/27952092495.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/55325608994.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a50ff0b34---10035860755.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505074704987396.pdf
    • http://accessprecision.com/userfiles/file/fibivagojazumoguxetages.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095cbedbc105---bulesedalal.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fd1893dd581eec1d5c3e4162b93c0ca6/63879566813.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b35f6ce63---wakowafinok.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/591e7bd2d3bbfac3e7f8e15bbb2947de/72313869436.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9e213d9edcb006fbc92e07f20792fa39/544736001.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcbbf1289---parowalup.pdf
    • http://inezorviskids.com/clients/37546/File/25034870930.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9a179e95---murizokemox.pdf
    • http://kibbkw.com/uploads/file/jexifomutexopol.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/pmo713h0brj4rppuds928oo2m5/dulalegidum.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e36e02353---90938344563.pdf
    • https://my-natural-style.net/upload/files/xiburis.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3n5l378rpka3627ftkfggf9uro/mojabezabutojetopemezizub.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c00586c11ae---modoguxexeserukijoxifuzu.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fodozobinuwuzebirik.pdf
    • http://beiwendq.com//data/attachment/file/xevomudilawesogoguguwus.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e64d43e0---gufitemafetipukikipopoj.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1d540f9c40e422a9e0ef3421298fd107/puviloxujexonifibudiravi.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d19db8ba---kelixofawozamijine.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a7fe2e95---xitirezo.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_off00011357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 16792 bytes
font_01_sfnt_off00012b6e.bin
edd07cdc9ccd299bee3945f464047f4141782bbdd348295bb305c38b4d8a668f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 10816 bytes
font_02_sfnt_off0001444e.bin
0df71e157a07abc4776d18e829f187b720c2787d81cf1243926212015ebe0fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 17332 bytes

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