Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bb0b9da712283e…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 09:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2bebb5ffe8af65c165e483cb92c324e SHA-1: 032a0eeaa0c623931c817c3b40fd070258280c79 SHA-256: 47bb0b9da712283eeddd8e6f727ccde6f6b51127f09df56fff7e64484b84e25e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=minnie+mouse+head+template+for+cake PDF link annotation
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c31940a901957d1857db7d6c09e7157c/88556843297.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fodowidepiruxojew.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wusijuger.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e375cad93---kemole.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r8mikr15b3s8k1rfpilrtr9087/jowadoborezetadam.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/binazola.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/566bbf2b976551018c66fecc26e5ea1d/vesokalu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99630991f2---48038447651.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd664b02d---70612929125.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/16107040006.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/64345591157.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a220b2c8---93984991156.pdfIn PDF document text
    • https://cis.ncu.edu.tw/document/files/27149587585.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813c20b143b---52412890474.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ea272cb3---38635164816.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/waxolasemaw.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/loxagetapujuju.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/19695617577.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/58268662260.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109a6e76396b---69968417258.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a1b038950ae8c17d2e9d7a0e3fc0df22/14857329385.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xopujexemu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/80037112096.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e806def6317cc5fd18bbd9bdc7f5ebbe/nunupiponofeletavoveva.pdfIn PDF document text
    • 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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 11072 bytes
SHA-256: b660134e3abe66f48acddac33ba8e6b972411b088ddf387da07fdd4f3de730dd
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 17708 bytes
SHA-256: 77e3663711b40385c5ef67d91143f7463e7736151182192c24d62a378e1dfc79
font_02_sfnt_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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