Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f26e4b7cdcc28fa…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 01:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f764c9fef1df3fbd22b35d1c178485a3 SHA-1: b348e0c7fe4b90b52efa557eeec341e13c419210 SHA-256: 0f26e4b7cdcc28faab297f8f6b2231ff11f94542a82657efabd5ba86184071bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the malicious URLs.

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://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4d8aae387b824f1f1ec5b7b5ca7d9771/tezobibejafasodozu.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ed37d77d69012a84717241487bdbf71/36933413415.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/fufomudanojuwop.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/zirizuw.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-19/20210619002128568742.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/51025630888.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7baca64803049af447028143c8d3b0a9/gidesojibudirilise.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/1401883357.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/pajujibogipatebediro.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/76350656615.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/61v06urpdlpkjs63dpfbms1id2/17822237255.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/dusemokadefanifudomatox.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7646316308---89308098120.pdfIn PDF document text
    • https://bczenekar.hu/files/file/45174218686.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zizimasexekavinukev.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/dojoxaxeki.pdfIn PDF document text
    • http://gapp.fr/medias/files/forevexidefizu.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210727_202014.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608274f2aa41f---gamiraji.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/8cdc899b74ba0e744c73aad72f67cb18/99629815946.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/580c8978f45d8eee664169e063ec36a7/nepakigup.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611b90963a995---20242936293.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef72ff1768---74626837000.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sabexitozaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+take+hdr+photos+on+iphonePDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 10612 bytes
SHA-256: 4500cecaae12d11f4869b393e7a03a6e53230ef169a7e76af1e45124b8b830d3
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 18056 bytes
SHA-256: 8b386513d1f36b177ef2d7d75caf3fa0e74e56d0776226a1c30ec7dbe514cbd1

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