Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cc663bfe92f2ff…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 13:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a55ecf8b357d07ca0041f8a3a426838 SHA-1: 0ff8059ab7e20a7721faa55201e788a5acf85d48 SHA-256: c3cc663bfe92f2ff753e49193f363b2fc70116e3d6c7a42308bce178397302ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF acts as a lure to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://allytemp.ru/uplcv?utm_term=watch+tv+show+with+friends+online PDF link annotation
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/96092323662.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/94701605649.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/mofebibuzofaxunebu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419c4584244---72745549306.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/kutudalapiv.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/6913122403.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/aa53c7ba1b1af3bce47248e1fb5e4e12/69733753746.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/fixuletogo.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/nexupugetajatifamil.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/75095507740.pdfIn PDF document text
    • http://ranchobg.com/img/file/67285483382.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/jenidukakesire.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f2cee9dd37acc5e3aaabd51e64b9eb9/zivunijiboru.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/minijadamu.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/69996286072.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/91313530976.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6aab1b0a---24821910036.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/8652741854.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/kelak.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/46839343585.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/49392924556.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc45122e7f---kuban.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/92703500686.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a24361e6dfe1d3bf4d517664ba08b31e/serosepidafikipiboze.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fkb2trb82un172dp96g8ncgls2/tuderofekeji.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_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 16032 bytes
SHA-256: 81b29967ba683eddb01e6c83a591b17dd9f89b2f43ecbd1a281a277c11be8407
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10720 bytes
SHA-256: b5de9487c9f4365587b79ebd4cab069ac1f7782c9fa856e360e575ee65c826cd

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