Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3070df7b33a556…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 19:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86698ec1082495f34623721344169f30 SHA-1: 6e56a6447e6b424b465a669e7e10aa5564e67424 SHA-256: 7b3070df7b33a556ecd61a63079bd373d1c4a9f1ff6229cdd83bab2844e0096c
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a remote-support tool lure. It contains numerous links to potentially compromised websites, suggesting an attempt to host or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7a592db85c383736381628608ff3d744/bifixedorug.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713062139c7---xedinuluxerez.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff4caf69e---7088372394.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/p59soietnfch60qj2m077elhp5/13195750002.pdf
    • http://lumieretvie.com/userfiles/file/92571373374.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086024324c53---larozowinavezifewasujuz.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ffb986e1---duxugiveretolekudupatar.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fb6a8db3e4f1ecbf00918d8dd80ad8e0/tafusejogexi.pdf
    • http://ipublicity.cz/data/file/donowibawotakikopurufo.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d72b3964fa3---mofawo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76600e38a---35803125940.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vavuxarodat.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fe20b9cfb0a5abfed41c0768053621f/widutidivubawopeloga.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcae5566cb---vorixajapixugirudejed.pdf
    • http://vencedor.coop/images/admin/file/gotefabinalemezavituluga.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607833b7ec271---92297626979.pdf
    • https://accuratesearch.com/userfiles/file/tofelezitigu.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/tevusod.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3fc31f6e8fb05a61d56d57d067d2b75a/89552247692.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/98iaf4d1elrcglcucviso1jrlj/xobutabelam.pdf
    • https://aterhesseg.com/up_image/file/95665659584.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/50nqvb6ssjh83dp1cud52eaojr/5068530308.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rlgahkfupggibnrj5do9boodi1/94917126917.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fvu5etm2havbrmsjopsuonfjsc/fokosefifuwu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0hm0pqa4lhvshbalnen01h8sfe/gipetavojupedamomo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=post+op+instructions+for+extractions+in+spanish
    • 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_off00010980.bin
7749fce53dfc8176735af0a377668500c866103795340bdbd056f6a43bd1a2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 17836 bytes
font_01_sfnt_off00013826.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
font_02_sfnt_off0001503d.bin
d7fcde5abcbc2fef6743a19b440aaa7b700d841f4208d39dc566e4b02e0908a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1503D 10732 bytes

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