Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c866d9463a5ebc4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 18:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b028279a2bf6ce39c9286a8362445167 SHA-1: b7b592deacb6f730ddc5fe7c8e9cf81ef353c199 SHA-256: 8c866d9463a5ebc47c5a82cceeb12e6d0dbe12dc914006e1b4ed1f639abcf267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fxlcd.com/upload/file/38652380863.pdf
    • https://extremedriveline.com/ckfinder/userfiles/files/tepomojowalapodewiv.pdf
    • http://cluboutletmoto.net/campannas/file/kofisofodiwesafotepevage.pdf
    • http://jljemc.com/upload/files/49844409494.pdf
    • http://giasuminhtam.com/Images_upload/files/46102810566.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/xepuruteligemuke.pdf
    • http://olivetheater.com/userData/board/file/negakevajekeropefebe.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/38925394724.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bajizelewolarosud.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0860d5f9---44150597594.pdf
    • http://makesomenoise.hu/upload/file/naxekapazobigul.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c70c7f7ee---47039754134.pdf
    • http://biurod9.pl/public/userfiles/file/71992782902.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/rakaboximuma.pdf
    • https://barcelona-health.com/files/galeria/files/30535265255.pdf
    • https://sgicorp.com/userfiles/files/wubitejevomilup.pdf
    • http://yh-nutri.com/filespath/files/20210902012342.pdf
    • http://bike-aholic.com/UserFiles/file/xetorusakikunofolazina.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c7c7e196---kesuvobawigobudibow.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/55739707217.pdf
    • http://membranekeyboard.pl/_data/file/87283139218.pdf
    • http://gazduire-domeniu.com/UserFiles/file/lolewigagoxar.pdf
    • http://brilspa.ro/userfiles/file///zizovaleburor.pdf
    • http://rimini-portal.de/bilderarchiv/file/62947799974.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mutton+chukka+recipe+in+tamil+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_off0000dfdd.bin
413bd7e7218b29df3810254cb7310296eae4e384a0c9fb4ecc5aa7bfb707b86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 18864 bytes
font_01_sfnt_off000110e3.bin
56d34f11260135cdaa6b697f2cbbd32f061b05806ba107c812b1213a102cd217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 10900 bytes
font_02_sfnt_off000129e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16792 bytes

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