Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee866ec839f1a07…

MALICIOUS

PDF

73.1 KB Created: 2021-07-03 07:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c8ed5a64d788e59919921b42e9227fb SHA-1: 01358d9eec1c281cc87ec705ed4034c008956c55 SHA-256: 6ee866ec839f1a0715f4b2a452a217a82bedb7222518c04e8f0ce8ce65445683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

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 https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4v544i51triq6uqra1pieemt8q/bopuwonesonelusiwo.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086978d3c600---vibugonumenorakatimat.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ff1500c96a733732a594024376747b2/pabibekuzukuve.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/11886268291.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756b48b6ea---sotimibetudesemagak.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ba153d448d6---nurowobor.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc52f543ba---98786160814.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qt1mkdk17vj0qj4pk6gq81jak0/nugudidetuw.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835463cd81e---kojegazaf.pdf
    • http://4bx.pl/public/file/sufutitigazojabisa.pdf
    • https://nnkcreations.com/userfiles/file/60535602666.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828958ab75c---84248206055.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9b772fcc5ee3062d2be8b09c47eeceef/nuviloxefepa.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6853bca88---68620867781.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be61bd40c9---22130472646.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gusilokom.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/10203a56446937f66bae11d47e1b21f8/jevamibunitub.pdf
    • https://nepalaviationmuseum.com/userfiles/files/81202383571.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d37736a18a7---juvizisasufale.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/at085ru57tjnj9vpdv9dq2ro7d/vimibasanesagilosupulom.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be580a175e1---81709467561.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc6af3fbd---21225159848.pdf
    • http://irinaburmistrova.ru/files/48458951190.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609792d47c6c3---doragoba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=evergreen+social+science+class+8+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_off0000bc8f.bin
eca2864505da19bfe8056dd34e74c9a243e6b178ea19d9ad49281b42d1a360fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8F 10956 bytes
font_01_sfnt_off0000d5d8.bin
be3084782e2bce2118f9b7273dd55a113e6b63335a3a98db14d3795b9b5f1a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 15920 bytes
font_02_sfnt_off0000fec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 16792 bytes

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