Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5c34e14537cd28…

MALICIOUS

PDF

109.5 KB Created: 2021-08-19 03:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 095321a82a372b52e6e01722f0e282ec SHA-1: 948379a250ff3ae0785ee1cc6f1264719432a6c1 SHA-256: 4b5c34e14537cd28d71f34f849743173b5da24c225a582f2d235d191f8c76405
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.contectrade.hu/fckfiles/file/81654326822.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa01bd771f---17186800627.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b47b77c74---83168793417.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e54c57b8b9b952252e5253112c9e3fbc/kokobixewemuxeferifabav.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/7264424710.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/62906139489.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/mudupidewusivitedusowero.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/525l6qdghbqi31q6mb2b6o4q1g/84582669111.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1820eb9144aacd1695e64ec5bee7bcb9/22320291639.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a049ee2449---73254222727.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5f6814de---wivolumodudixali.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/32812352201.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160801b17a7a72---keforew.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609085a35df9e---93168866286.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba69f28e2---56281908152.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/78977947636.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/56807118403.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3945a03a4b---16383303128.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/81278491487.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/688dd6bd8d9df40ef5c0cb50ffe59fb1/gewabixotegibotofe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e82917ac4---73026741575.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982ef4e64c.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611983041d310---gelipe.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/39700517723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+up+dmx+512+controllerPDF 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_off0001452a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452A 11008 bytes
SHA-256: 9106d72e499231b886a388bb85a02b3e5f27441361bf79b51de277622a062c59
font_01_sfnt_off00015ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE7 18308 bytes
SHA-256: 93753c499223a873f4cfb24b793b6548b51e50a3e6abafb59b9f4b69b374372d
font_02_sfnt_off00018f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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