Malicious PDF — malware analysis report

Static analysis result for SHA-256 756d5393a69fb873…

MALICIOUS

PDF

92.7 KB Created: 2021-07-01 15:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: decc5145adba777a39aa9b5b8f2dc0d9 SHA-1: c0430da5c44d8da888a4164f0aa0137dfb3a093c SHA-256: 756d5393a69fb8737079554e28914a5eab59d5a27c4a5071b503c9ad0da52dc8
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sensiblemachines.com/ckfinder/core/connector/php/files/nerevoguletijugolivopu.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1b55696f---48390563177.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ada2065f4a1---bemotabit.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/61285755452.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798876efe43---50688033472.pdf
    • http://splogservice.ru/content/file/87702712448.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5c876e2a---50499057085.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/81056238391.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a3b530d5ad965211650960919a16b1cf/68501874772.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a388cb7---tutidegijadakagik.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160839568788c4---xenixavenikipamu.pdf
    • http://fresh-j.info/images/uploadedimages/file/42913664782.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d8b5f234af87f9c25e4e6b2e5956aec5/38257684144.pdf
    • http://bobiniauto.com/userfiles/file/zeropipif.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/69973471965.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/agsqcdeb0ul2bpujg23dn19dcj/31476386101.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/eqvmredocs2bg6l71m73a4hgc7/29976800835.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bicep+weight+exercises
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 16792 bytes
font_01_sfnt_off00012004.bin
5f30c674db1ae2e41bf58bc1a39e35681efcc1cf5479767796d86134525750f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 10464 bytes
font_02_sfnt_off00013808.bin
e938d9dd4d7a48430fc2da29939e49ff80b7dacfb6a71ad4a778da187d046a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 17124 bytes

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