Malicious PDF — malware analysis report

Static analysis result for SHA-256 289ed3839bc8fe7f…

MALICIOUS

PDF

101.9 KB Created: 2021-07-02 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5652d17358a654749f0bfea1d7651b97 SHA-1: fc5f148d3c8b5f9eeb7047fb9e4ce1b1059a0898 SHA-256: 289ed3839bc8fe7f5393bb7a0949eb96a9b3515eeb8fdd399e042c16f09e28e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates an attempt to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://chcial.ru/uplcv?utm_term=a+cat+on+a+hot+tin+roof+pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160749a8de8fc6---36304125621.pdf
    • http://icmasistemas.com/userfiles/files/17758036335.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805c28bff55---81719391456.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1e25kldv292u8rs7l6gn6o5v8m/jabetopenutalul.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1de02cb35---19335802090.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81bd8bdf0---desuwuzuvegid.pdf
    • https://tamphuctriland.vn/upload/files/rumesako.pdf
    • https://acrgroup.nl/userfiles/file/mokovuwofukanewa.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a779c725932---53058662505.pdf
    • https://majorsagilekvaros.hu/uploads/file/1371530547.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f6372a1e04b5c3d154ac676068c100ab/guwugog.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a461a2195c6---diwixujabonujuvaro.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aae297960768e42dc72a206bc8ed88ad/maxoxanerumesegozudodole.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106282336384234.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec24d756d---liwajuduxitovi.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/avhrtu7oigued7shal2bm866n3/28671655577.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5e014778---47120045395.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9353bb060af22eaa04fd302cb06a42fb/54489033952.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d8b6e705cea6c97a3e22206c53395392/kememuxafutewajiw.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f47b3fd45e888d648d6bfaa2ca7e483/saditulevoxupiw.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7709cd986130c3c1554df8740b646619/51876289832.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ttga8ttnoa9aguu2aq8cm9rgvl/bupumadazojavixekupib.pdf
    • http://exima.kr/userData/board/file/49933025823.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fe731a6a---78021179896.pdf
    • 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_off0001230f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 16792 bytes
font_01_sfnt_off00013b26.bin
527f473b4501d011f353686cdba34149ad927e748f3e17126c64188c007cf0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 10352 bytes
font_02_sfnt_off00015276.bin
60233a0f5073675c75fe91a78d413c37daf5ca57ba2cb42e5ed3f9ca68812761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15276 21604 bytes

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