Malicious PDF — malware analysis report

Static analysis result for SHA-256 185ec1578c2a6a59…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 09:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d685aef643c1837fecb317e6caf2f9d SHA-1: 55b11f41c2920a9db465a9a8d2a23b6800a45a71 SHA-256: 185ec1578c2a6a590aac4dde3028505ba24fd333cd1d7b9593c87c45f39692a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and the sheer volume of links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=pradhan+mantri+awas+yojana+in+marathi+pdf+free+download
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41370d36cc---kebozejedap.pdf
    • http://khangvietdn.com/uploads/file/4322592874.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/pezazexugaluteg.pdf
    • http://orthopaede4you.de/userfiles/file/71970383357.pdf
    • http://bbfrontedelmare.com/userfiles/files/39827543746.pdf
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/gagagafepumepatesi.pdf
    • http://sibinetweek.ru/userfiles/file/84912537157.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608196fa1017c---43328101962.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c535a6861f5---wokadukakevipafofetufun.pdf
    • http://papinchess.ru/userfiles/file/25559908972.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/relup.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/98ac8940db549c3cac3e801be8a70fc3/lisiguturugaxifuzafuleriv.pdf
    • http://angelcabrera.com/FCKfiles/file/lijakulefam.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/siporadolesalerabuvale.pdf
    • http://podhoru.cz/userfiles/file/1726877057.pdf
    • http://ugyvednok.hu/userfiles/file/67393029198.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/82804967662.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45576fdfd---6280796758.pdf
    • http://smclassof57.org/clients/34860/File/95421571385.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3711ecee60e621dacd17ae303b8dea83/balek.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/suninofobakefupitamupu.pdf
    • http://selfmadefilms.nl/userfiles/files/serokituvoxawe.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e57552249---15083551522.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7a3e86c442b21c21a875948970eaf721/17520429208.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_off0000d2fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16792 bytes
font_01_sfnt_off0000eb0d.bin
97c6ccbf795315d41f5d33db9a33e39fbfd2f918fb7b945535f2a99e3ea036e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 17720 bytes
font_02_sfnt_off00011951.bin
efe7131033b4286fc12ae36785437b76683080854b6f89c591d54e013443cdff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 11096 bytes