Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b113bc4e6f051…

MALICIOUS

PDF

81.5 KB Created: 2021-06-30 05:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca6937568d4a6f8dc58cd6a4bb359426 SHA-1: 99be7780b86ed6b1d263c3c4066b1ec2d570ff05 SHA-256: 812b113bc4e6f051a203d09287ce01ea795279946144afcc909d3690ded2c37a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these compromised URLs. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://polimak.pl/userfiles/file/desoximuluvazijokiduwax.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e616c9e012---41863829428.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/37625663488.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070767cce00c---lerilevukez.pdf
    • http://ubest.ru/images/file/3328212706.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad01c3531---rofup.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e321a2575c---2605789130.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2b0b08b3---sopajotakejokodarodosa.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fced04414d93faecf855319c609df8cf/73833776702.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/467652958ab5d05d10555aa318348c71/tikumuvanenegagipifalofes.pdf
    • http://poorclarescork.ie/images/vogijelopijipoke.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vevekukixulokivo.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/7j40a9n5ri1qmnp7mc4b6och1i/loredogusuwakexusibagewap.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b886118664f---tegilodajutojovikinunoge.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5053f24f077488ab26f9fc685726af9b/21837225593.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d8091d0692023059a32bd03825886b4b/divuxavodobolo.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942ae74bf27---vizajux.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c5e22dedcc2597e3cfb9635e4a8eec04/4227318796.pdf
    • https://motelandratecuci.ro/userfiles/file/lodakuvuvofagebiz.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/41ba4cf67abbc8240021c2291b6a8fa1/nagujizalevogaxajepo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6732a33b---nevovijaxojaf.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609319811d117---pujepoveket.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o72lhpfh15cc143mdcvvcoc0st/nigenuxakotarizenosawere.pdf
    • http://jrpst.pl/userfiles/file/madelejadarumoratevupofo.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/37874291580.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b956cbbfa72---13659259563.pdf
    • http://fipjp.com/userfiles/file/54347589640.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=copying+file+names+into+excel
    • 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_off0000db53.bin
3191e9eef6e718f2046fe37b693fd7f7088e6f2217334ec8ef9810b488201b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10972 bytes
font_01_sfnt_off0000f4e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16792 bytes
font_02_sfnt_off00010cf6.bin
d0aa8498be1fc4365d23bfa2298c3ebaf9ed8f8b32c15cf3abb9b6f1ae9e8b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 16868 bytes

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