Malicious PDF — malware analysis report

Static analysis result for SHA-256 337a7b45502ccaa9…

MALICIOUS

PDF

126.5 KB Created: 2021-08-20 14:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcbbf105b235828d7424d22cf236ad5d SHA-1: a84cc30e34a2d68cfd967107c8e84b5b370781b2 SHA-256: 337a7b45502ccaa9aa43a0633ee38d04b10a0d9fc30d86f0adfb616c7ae2eb9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=fender+stratocaster+large+headstock+template PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609531b83cd50---27193959247.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/940862c4b0f38c523bb84a3e47e06c22/44492726138.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddd1fb9339---fadifofasalosi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc640b956---68141081944.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/wivufoduke.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rvr3fl43bprqrva7jrdtrtrftt/16233732576.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e77a81a925f---1576456972.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/dd1b9471e711ba64e9d0230380451196/pivekifugopebumu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/54468995867.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/87224702450.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/1696834117.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d20fc36bb---2671337905.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836594cb1e9---67390175100.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65d328217---14753447666.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070394ad8d1f---23251854441.pdfIn PDF document text
    • http://orderkai.com/uploads/files/28111801936.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/63295138500.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5d3ea125---talenix.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02179556fd---5907415297.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/40214263940.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/oc4cr9vbe2gvb4dnkpv9t9vd60/56797735192.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/ridafugi.pdfIn PDF document text
    • 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_off00018d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5AF 10940 bytes
SHA-256: 98cbf2a8541d2da72df9fc11c8aaf3d78f91bcc679a55dc26086fe5a11f19d21
font_02_sfnt_off0001bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA0 17156 bytes
SHA-256: c29d1e65253493550df4ae896340290f8f19309e62df0313907935bc02408116

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