Malicious PDF — malware analysis report

Static analysis result for SHA-256 978a8afb313d8871…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 16:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7467a3cd13aa92aebfe51bc415cb63a0 SHA-1: 99a43663625c8f6941b86fa992785d48c1eedc2b SHA-256: 978a8afb313d88714bb59279c8932abf09daebb0e077187eb9aa796d43abaf93
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious sites, rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://broadviewlibrary.org/uploaded_bvlib/file/zinilisedipuruberakedapar.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f75bef331---sexir.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1807c07ae7---85216094248.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c001a630a---wanupezasi.pdf
    • http://buergerforum-tirol.at/file/92559296058.pdf
    • http://cpghollywood.com/userfiles/files/ripage.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/73ldguq2l3veajkt1lvr3e7dcn/xaritofupuvipadevivotu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/31323127072.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ed4d883b1---dinagubabagizevobesa.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb14f04c206---43489686460.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/40a82a26713cee452c4e3974689d4e31/64472794055.pdf
    • https://liniagdanskzydowo.pl/files/47277194687.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d654e0251f94ab32620d716b572b1020/jejevegepufiz.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070395a33799---36686351829.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u031fmf5alr297v321s3mhvenl/69260830721.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d0b823f4---37437907795.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49511994a---sujapomuzulivepido.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1b4s7tspd0ac477aokb6tefj37/75489852157.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/92286190846361988c68ca2a2ab64611/11448284583.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f71c7d1e57547a0e567feab82bc97d87/laxuwexujajigud.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160811de6b7073---fudojenuwak.pdf
    • http://sattosushi.com/uploads/files/31332780639.pdf
    • https://tsegypt.com/file/pakuzupisixafalopiw.pdf
    • https://alianzatours.com/imagenes/file/suremu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4191e38b---76142977033.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=importance+of+job+analysis+in+hrm+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_off0000ebe4.bin
569b31093dce54dbfa3655ab44ab9f26fc93ec7b4952e86b93dabda2d01bc22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 17624 bytes
font_01_sfnt_off00011a21.bin
61c280fc343386641fb6314e3af8caa0fd176e112dc74a6a4e48233ad2f95ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 11220 bytes
font_02_sfnt_off000133f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 16792 bytes

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