Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e50b629c5d1d11…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 02:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a010aa2d063de336bd8b70e385732e0 SHA-1: 9d1328b19496017a07215a2ca1440bc37e405e1f SHA-256: f5e50b629c5d1d11235fc1095067c3955feab2fb926aef34aeb9c939e7b6057d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable binary data, providing no direct user-facing lure.

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 https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a7890b688e3204e69851a68c344abee7/gitagadalukuledasuzoweza.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9d459dad---49347177909.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/1550554014.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d02f1d75e4f---45923856815.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/niwedesikuzejafek.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/81913750447.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161009cd759b1e---mepufujiwidufolipevusofow.pdfIn PDF document text
    • https://silga.ca/userfiles/file/fimarap.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wiruxovujiwetaxaroz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5a31e2ad04f79e8a8562216b14902f23/96516942974.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab74d0c7f59---43328363836.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/14873613499.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/22bd7d445dc3d289473d28ad6d0c4428/lolaxasagolujevejir.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vigupabojexubapaj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084374760dba---beranekekudu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731eca19177---gudar.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/97717598461.pdfIn PDF document text
    • https://nexusmediation.nl/files/88694632734.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6ed28f89---64331747975.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wajuza.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/90780203605.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/5781533835.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/levonuzolamom.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b2b2a579f05db23e53a3683747d9d97/gupexixiniri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reflective+journal+writing+pdfPDF 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_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 17640 bytes
SHA-256: c24a37cc7d4bff84770ec0566efab886be03ccef3d6b0caea8b29f1622a02e86
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 11056 bytes
SHA-256: 0592c9511138cc619cdd1bd75e23a2e77830556f6207a8347ec195afbdb5eb78

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