Malicious PDF — malware analysis report

Static analysis result for SHA-256 db50efdc15fe6992…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 22:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5b4389ad7086ec2e32714a4e4fc3c30 SHA-1: c153a3060f1d9bc259c84ec7e3194393b0083ade SHA-256: db50efdc15fe6992e1b437423b400fb23a5e6a47de8fbace5b7fa2699086040f
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 document functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns. While no scripts were explicitly extracted, the nature of the link farm and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=facilities+maintenance+manager+job+description+pdf PDF link annotation
    • http://kunjipsc.com/uploads/files/dabosulokomusefuv.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/5954470880.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/5138720972.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76212359f---62238557816.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/gotaxuvovalerotorunusa.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/pifamosoma.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4cafcdf66d44a9a5c35a395917cb182c/96052632134.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ea01991c---dikupojorizofibawason.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/33282821019.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/75828743479.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084be4dbcc34---93886493275.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/18168396166.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lfin6ps4vjll03u8n4uu12e964/59133918413.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/lixawez.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/tuvuzukijuxufuxofujenas.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/32acf6s2cvdlj3v4d4u7uejmr5/wadibudi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/66929562447.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 16764 bytes
SHA-256: 95402f01bcc0ca32e3a5fa0b2260f90d42790895972d5e8a169a62674a4298e8
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 11212 bytes
SHA-256: c7fe094f4bb74580d86513f053202571a78424988c041e2c708a5f1eb48c5411