Malicious PDF — malware analysis report

Static analysis result for SHA-256 8687c63fccdde109…

MALICIOUS

PDF

84.0 KB Created: 2021-08-25 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 345d1573ec6277c72e2d46b468ac5f12 SHA-1: 8d1a8f6180cee1aea748b5a55cd96459c6447567 SHA-256: 8687c63fccdde109c7f70db90c4a04ca8e51c387c613117de62a7be9e563d82d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=world+investment+report+2000 PDF link annotation
    • http://ned.ru/uploads/files/55030640974.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724879d2a93---vomexapudukogedekalate.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ef73d88d4984c0be14bc2ebe985f03d9/zidozefivinabogegefedakof.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9daafdaa70d1e940851a9a8272739de4/63293665752.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/tafoketugumobuba.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/39696399791.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/jozijisoratajiz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f35119e6d5e---24506413678.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c2e699ec4a57d15b6017959d817d41f9/jotabanawidekagowaxupug.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/ronirado.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46493303712.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/pusetefijezomadefiteb.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/94244109381.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337510a71e---22738192932.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/38146494373.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/49838851142.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a115d1f201d---85090820169.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/nolajubolaburuvekegu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/72139400236.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/da45anmrn4css9mjfq5ueunmjt/33741776659.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/064a39f28f9d2cdbbe851ddbed9f9e07/12616087027.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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 10692 bytes
SHA-256: fc3b36a8038abb26a6dd9b4c9434c63a927974db4b481b2a4f1c97f687b4f747
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16968 bytes
SHA-256: 6d77a1c1f04dd28615962585a280aa7af03c351b2ea7f9344245833085f97fe2

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