Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa1bf26ec0773fa…

MALICIOUS

PDF

80.7 KB Created: 2021-06-25 14:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 732a0d515d79875b51aa46af75af3e28 SHA-1: ae874c08ee5ffba11229fedb3d67296fb6882237 SHA-256: 5fa1bf26ec0773faf127bcf53d56f17de1f89456d045deeca5398369e7c2d0e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=can+i+get+pregnant+after+taking+p2
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/76c1c0c8088d69e52640c13dc36c8ae3/magudarowovuxavofavar.pdf
    • https://canionglobal.com/FCKeditor/file/solilenexaripanejaxamaw.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/966f234ffbc92ca20f48dee5f45f2ce8/47056127238.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb687ec5627---78308567520.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v7m4vv26m7bqvvhpgu2svnedpr/zebijatutamuvavigo.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d7a599d2---13115305751.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/67fa5c0df030d840ed33101679802692/rajuxegalubevugonolevifom.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/83354046435.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/movolepiripixonaju.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/99175314622.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2887411fa6c488ad6d4378fdf686c022/xunaxedetur.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1c26b9746be6166ffae00829ee326768/letufutefepor.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd340d541e---piletirug.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_off0000d8a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 16792 bytes
font_01_sfnt_off0000f0b8.bin
04e71e8bf6af026629f5e7228ce83094614c7c0e5624d891264d9290c6b643eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 16972 bytes
font_02_sfnt_off00011cd7.bin
52271e4a3ac96606b102f51b67b2c017bfb51834e5955a255b7e64e6ec194a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 10444 bytes

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