Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8273b6423ebe2c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 09:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2900d73f0278f40db19077838bc3dbc5 SHA-1: 0de628ad798658f180ca7daf283ee3f17f9f057e SHA-256: cf8273b6423ebe2c9262e6f80b7d37388ce0b3a24dd655930cc455099e0ef2ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a phishing or malware distribution scheme leveraging compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ride.hu/images/uploads/files/kexiparutupamixuluteru.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613504b90f0a6---54508964154.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/jogiti.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/48477868392.pdfIn PDF document text
    • http://hncastlecable.com/d/files/14786286420.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/mivexiwatoboxojimesiv.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/73193160865.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a261819e4613b690d33c77e4d329e2d5/veraziwu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wilomezebevidafo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4afe6a5b6---tizapa.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/wimimeximevofezipetideruv.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaad766c96---45965111012.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609140553e0e4---bawuvaz.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nikifelivo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b6f7e1aca4f0380a8f553f98dfe12b98/xowaxipevelo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68a89c7fd---dumob.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faea8c10f6---54585958313.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mdqe2g0ball3olt1jpodlbudjs/voniwiwej.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/gonuze.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/58180553272.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/negudowek.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/19327964352.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073345a5a4bb---22412988426.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__611F0E0F944E9.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4b76e6c8c911df7974b1f87cc63dad77/divemuvifeloxitog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sandhyavandanam+tamil+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 20136 bytes
SHA-256: ba9daeb54e5a01e8be45bb4e0d25b40ff8f964440465d3e09bb8ff3822c9876e
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 10936 bytes
SHA-256: cd43d14ab8ea011563d13a6a09cedd87ff6037d5778aae9258348a5a277975ad

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