Malicious PDF — malware analysis report

Static analysis result for SHA-256 778a752a434f72cb…

MALICIOUS

PDF

77.2 KB Created: 2021-07-27 21:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1c8a66bb7e023feedeedf191c0d72c6 SHA-1: a95f5bfff1bfdea581216848a20aceecaf5c025b SHA-256: 778a752a434f72cb3d60886027ca083d1f3dc0b3254f168ff8d2e93b43c61671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mo3fjj0idm2bked0jbitdrvehf/barixesumerizejopavoguje.pdf In PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/bepogojawedagekazenava.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770eba7dc59---18759695366.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/xabaj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47433376773.pdfIn PDF document text
    • https://led7.ru/file/befukagokosulu.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/21030693710.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xuzaxofuvakotato.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/15219879730.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a24f7b7c62466eb8c792e9e25bcea2a0/51408262560.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8f9a2c36d05334114fa98cee25e7058b/fuxulinawiwiturew.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6672924d5b716ae435c73cfe00d29ee4/dowoki.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6c858959---jusulevupukexag.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/retipupunamigaxulavufede.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c432f3d9150e1c5fc6689a971c8d77e5/zibukudexuwawomasideme.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac1c263f8---lopow.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/sizikopigademozunek.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/36575951616.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/68f92f9a03f0fdf9d6f0d6a2452d9483/60059461438.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/7064923993.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/55414711786.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/62bac410b6ec4e874bbc72f95d455f5f/sejedem.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0afd152b1b1012c65bf892a9a2b867f4/99812240452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=troubleshooting+a+badger+5+garbage+disposalPDF 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_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 15780 bytes
SHA-256: e4b370c79eb146dae3d55aef7cfd42702007df8681c8f1b27db0fd7e785b09ff
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 11008 bytes
SHA-256: 782ac568afb2c46b4a45b32cba6a4bf6e3c7d61a49014d18bfc039fd9daf3e17
font_02_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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