Malicious PDF — malware analysis report

Static analysis result for SHA-256 f995b7d733f31302…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 15:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f859403188b757fdbacd63db5db932d SHA-1: 9177b3ac481be186e8d948546136c0ffe07df83d SHA-256: f995b7d733f313027424cba92b470ca3eec9dd90a2ef44f4b1765b6f6178ccd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly indicate the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/fb7qd104k91u364e82h8ahcjum/dozigawapanorekis.pdf In PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/93585712563.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8hig0ru9tvd57ehdu6jhpec2a5/kezodonikopixiso.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/682517a496e41e869f7a219da7a89827/ziruvit.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a992e388699---soduv.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7c86964fa40a04df5dcaaaffd132d8a1/rebilukakunagofop.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/29937823c6b083cb1cf236cdfa020233/nibutomalawowolono.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/36587231146.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b692283545---nenekubamobuviditaride.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/n93tl99skv26hr93qg8kjbg8bs/rabemase.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/49818668432.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/16763968221.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gkf75g960viq0agvip3smk0tf7/86194657974.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/81629997495.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/916b036ec565a5cfa12f88ae01ccf0dc/zoturopavitisapifu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fanukeliv.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jejuz.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/18929425321.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/waradapinazuxegumo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/70565431472.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/tatanirolelid.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e14ce13ae942fd20bc89de662d0e0387/pesadifusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=probability+word+problems+worksheets+5th+gradePDF 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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 17036 bytes
SHA-256: 67b9435a289005babc955485f63819a4bfedaeaa60b86a01d7c4391eba11c8ae
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 11300 bytes
SHA-256: 8b3538b852a6c88cc2ca1dc6ad357970c10cb3b900921e59b8d241001bdf7959

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