Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e1fc6a7233b696…

MALICIOUS

PDF

87.8 KB Created: 2021-09-03 03:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af66d9899e903c636a13c1f3792ecd1c SHA-1: 98e3aa9aa6c771fb54e4bc19ecb862b1ea20d10a SHA-256: c0e1fc6a7233b6968cf2a7179318d855f96db9343d6d1324335f61dcf20d4f5b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these external sites, likely for phishing or malware distribution.

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8027c11b10---36467297488.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/5545142246.pdfIn PDF document text
    • http://darstin.com/userfiles/files/74831438298.pdfIn PDF document text
    • http://health-bridge.in/upload/file/9206928204.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/medino.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hk75l8skgphjoaqi27kn72200s/53313748122.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e3e850108---54310862149.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/degefuxezasiwukupo.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/85419004380.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/kuloxefi.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vukisomujonovi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/68804402388.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pavap.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/16519771618.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c19b6b65---95545896130.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/59716326012.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072466e56ce7---xofizuvofawufagepekoto.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe60c1f559---84021422679.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985e1752b---90052301428.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nivin.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e875326e---10797003149.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/bisez.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bbvuba1csdc926s6c0jjs8g9d0/wigafasatoxaxe.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2f0e9ae5c6864227be95d2512bbd10fc/kajiloxedokedifoba.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ff8c5f5c3c5762fef9a6187de102b4ef/gamemogavojidemib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=production+system+pdf+bookPDF 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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 11020 bytes
SHA-256: a494dc3a33d6d789cf1fb864ef8c18591fe32c525df164098ab5541a62d830f9
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 18912 bytes
SHA-256: a3582d088c8a75d3a726672a106a1617f11bdbb9e6c6e14777357d6ecec8b49a

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