Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3de5ee08e36accc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 16:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ac2bd453be97f178b4806e351e5aa06 SHA-1: 0a5dd98cd6b2fdbf2525bee63110055946a55ee1 SHA-256: f3de5ee08e36accc06fa0b9533b224fab1c4af650f46ae7bf3d930793de75ade
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b7f9e474---fuvogovisu.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0e0ce94c6d39a460d5fa1df1046f4bef/36441805474.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2ffe926703ed6db1f8dd5707ef34ea7b/19310193804.pdfIn PDF document text
    • http://www.moyekolodin.com/files/detiva.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/53699340180.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/potivezozakiburironep.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4edou4jakkcdmu7m8hmr7cjr74/bovenonix.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/43885411726.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d7575a52---52165075593.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/94d4fc7eb7f0487b6ba1ccdc91e598c4/55347348912.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131308d131e6---pupufadazedokugofubisafop.pdfIn PDF document text
    • http://weingut-suppan.at/files/55326562832.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b125b8046788ff735f04ae50709f61b/lirodifovajul.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/67116858677.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5hmf8b54frunv5j7js1bi9gqfp/65392499904.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bbbe02c93b3cf5dd19215e41d52d2bd4/75175850785.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/rotarosugumimakewumi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df0e0c0ddb4000c250c9a056e2dd3ba9/27747490046.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088e38523cdc---teginiveto.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/69174365420.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/rovudirebaxaw.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/73541366537.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c40a0ed5803b42352f0c6f32db114907/tapafetarap.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/95131015894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=perkin+reaction+pdfPDF 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_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10492 bytes
SHA-256: fe5e209fede1be8413a1e32e3f2dc8d06f1631d3aaba1d8add3aea380114917f
font_02_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 18232 bytes
SHA-256: e1cea44b639b7e8b0fe2f8da81995c2a2f92f29e1ab6c77620338b3b7aee05d4