Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e427a9705d96833…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 15:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f864b7e2ca4947182b87fd8e0f5f31bb SHA-1: e8a5e35f2fdfa182586e22f1ef95d49ce23a23b9 SHA-256: 9e427a9705d968339de18733bcf1d643eaf35dcc246e83964be5052242c83d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://birnagarcollege.in/userfiles/file/27755746983.pdf
    • https://alternativecarrepair.com/userfiles/file/33568249645.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d084f218064---32000984529.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8b6dd93d---19104934145.pdf
    • http://circuitoinsulargc.com/documentos/file/xifamujo.pdf
    • http://kiemtoanhaiphong.vn/upload/files/seluxewu.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca85a7d8574---49625951549.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/zosuwexan.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5e0c9e3a213e349a2c495eb3cb67bdc8/loxiwatesel.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa56d464c0---49661782253.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/282df50gr0ivlh0o2ac1hkqqlp/73610415152.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a708fb0c4be---18949657472.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796a84763ff---84787957221.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1807eb8f---6963114620.pdf
    • http://thepnguyentran.com/media/ftp/file/xiludevinoruleret.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bucue9h0nb6qjtkgb7d9sdqj8k/dadiki.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608933dd9b501---69914178762.pdf
    • http://szkolka-wiercioch.pl/files/file/dezefiduri.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4ce26882---kiriwefuxa.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ce160248---53991669750.pdf
    • http://studiotecniconuti.it/userfiles/files/6538003021.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=coin+master+free+today
    • 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_off0000ed99.bin
aff0bab7fce54c9e5f216b977737bbacf95fa9d21506098bf21829b732379719
pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 10612 bytes
font_01_sfnt_off000105e5.bin
60ffcf6d3b3e9a13acf7117e7fa9951ecd16893fa3f930afac19610ad206178f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16588 bytes
font_02_sfnt_off000130f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 16792 bytes