Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1c9b1bf91f6a50…

MALICIOUS

PDF

131.2 KB Created: 2021-06-27 22:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b36ab38f9f3f42529a17a9bc315f5e1 SHA-1: 4dc53cd205f6a1eb6fb361db171017bb1a7ad51c SHA-256: 8a1c9b1bf91f6a509060cfd2f28abf81a47daff764ad932c3b5def9d11b2efa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests this PDF is used as a lure to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://drafthe.ru/uplcv?utm_term=what+agreement+has+the+temple+of+god+with+idols
    • http://ajivikafinance.com/userfiles/file/rosibofoneveb.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/achk70j7aruv0ltddnkh9507pq/wekajususis.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98db38e76---kosemavuxevo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766c55415dc---wuroxiwa.pdf
    • https://a2designbg.com/userfiles/file/34372016159.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0550873a3f---89423880221.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094973a1b49e---mamovaxuwabiwetit.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qte3cku7jc76959leg5tpktg7j/bowedani.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r23pq79m1ehte5f7peeffgm3cl/vipowupuvazon.pdf
    • https://autoteam.in/ckfinder/userfiles/files/jonalodedopufewud.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3856d5210b4d21e2c902f61a6c87ab07/16982962753.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c123b6359---deteneziterinuw.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad3e6ef3b---tatojepisonazegewor.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219b42e9c6---simujodokebumane.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092886443d07---59197965483.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebeb862923---zifisulawajirefe.pdf
    • http://princeton1959.com/clients/863834/File/zurokizewunafipi.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/12086183730.pdf
    • http://ncabhsa.com/clients/875427/File/46708765323.pdf
    • http://bioident.pl/photos_fck/file/gozojinevefoxes.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dp81gofmidr0b0sh1qn9gqr9v7/wetamipalunopotowawebeka.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffb15d649---rejosopomematubedabipeji.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4ce295dcba71117a69c1b017a2a0d86/53797620629.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d568168582---19421736393.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_off00019f04.bin
4947161e8ff34ca84261f5dda45acd78ab13153b3cde6dbe3298aeb32db41dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F04 17868 bytes
font_01_sfnt_off0001cd6c.bin
f8f48c4096a7bc0cf47ad9d03007ca048f364530fd7a96d38d3bda5a0320eeb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD6C 11024 bytes
font_02_sfnt_off0001e6b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6B3 16792 bytes

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