Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfce55ec04b0a83…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 09:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d64f5d74a6a481c39c566fb2fd9ae7d SHA-1: 109351e4fb69a3f7679283fb4dd29790075476af SHA-256: 8bfce55ec04b0a831cf56b3efe2c55aea77a1b2ead27ee8ddcf7d304f403d4a1
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 are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://zonwering-nederland.nl/ckfinder/userfiles/files/33699364169.pdf
    • http://muszempilla.com/files/file/54639585992.pdf
    • http://murphysbeads.com/clients/54316/File/finizobedovesuguvek.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63a9eb34---13037732666.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3e36753e---dezijamiba.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/d48cdf2e63589c63a6c36d539b5206a0/pebadajoz.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf6722a73.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63c382bcb---nibodepifowigus.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b11362a6ad2---63463662158.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a785676b888---zewowelotixidogotot.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d30829c4789b1cec121e4799ac568e8e/ropolarow.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb7a8e52e---musarafalixevego.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/h07th9gubqupmh88uii2q6qvg0/nusapufug.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c6b92e60---4251396835.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160801777060f8---nigebuduwami.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/44ebbe6f28a39f9e1e8b210594e56771/kidusaledekomaxemidomemi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5cb3413e8---wunujadipuzeluluvi.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb9515364---34639929777.pdf
    • http://masan315.net/board/imagefile/file/xojaluvofasagejejelewat.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db45eb7f26---wavujipotilulade.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c233ef83b29---demusuzadalepasirirojeb.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608625b3d5840---51225323392.pdf
    • http://wksx.top/images/userfiles/file/boxovutu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dynamite+bts+song+download+mp4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e734.bin
de4d6d5605fac8c64269d7382bee385bed60c1345a952e8ba058e83b1a68db69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 17472 bytes
font_01_sfnt_off00011514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 16792 bytes
font_02_sfnt_off00012d2b.bin
572bb58f67d7710db504987e4f197f4b07c5991f1892333a7f80fda27afdfe3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 11052 bytes

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