Malicious PDF — malware analysis report

Static analysis result for SHA-256 846fc84bf8a485e8…

MALICIOUS

PDF

78.2 KB Created: 2021-06-05 12:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3093ae80221a9a82dc933e2a6f97baa6 SHA-1: 4e3ff5d96deec59b189578d7d2cb501422417d6a SHA-256: 846fc84bf8a485e80bec9c8ffc6cb120acb23ddbe95d9362231212e4d2615ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=cu%25C3%25A1ntos+litros+tiene+un+gal%25C3%25B3n+de+agua PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c62bec01---bejabaw.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/derasolakadurazukowifexok.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072979eccb50---dimifosubujevuniroferixa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e68bd55c0---fodelutidulisadosixa.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c4945727bf04fc293d9612e7e113c506/lofiguravalekufu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071236be25c6---87356869273.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/19444e338560297914660ef8403d8eb8/4788630871.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/dewopemoboneb.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee8add5c0---12199207807.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fcf3195a46367927c73672548d0a9fd2/xibofugibuler.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/252reqbcgcg5eh7mgmth28v024/nelenuxelu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079db6f095c0---14799951691.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/kixog.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/36aca8bc1a9e1fcc203dc9935b78d805/suvabusapabariwamejonos.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7946b37b8---resof.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ae18a6e4---resipovimudutojolupizofi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8553ba904---bipikimujowazonafobim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 5268 bytes
SHA-256: ecdd5ed39fa1edc66b8657fa1c28ad59230455687e7df386a04f6b4eb8705124
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 12308 bytes
SHA-256: 6ca3043007e0b6a6ff932cf35d3fcc9612ec251ad9862697312c2fa63c3b9e2c
font_02_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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