Malicious PDF — malware analysis report

Static analysis result for SHA-256 d174ff510f4be41b…

MALICIOUS

PDF

74.4 KB Created: 2021-05-31 03:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffc66c493711de5c6e7c8a05e473736f SHA-1: edfd47965562fe7b4db8601838f33f21ff1cb3f2 SHA-256: d174ff510f4be41b52fb271ce8c5d8129ab0293533fe29b5d3808b29f994e97a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

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://laborke.ru/uplcv?utm_term=cardfight+vanguard+battle+simulator
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609036086c1bc---26461450624.pdf
    • http://thankschicken.com/uploads/files/92194759287.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d30e8ab2a---86744136737.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0569cae2eabc9bb4c820a4a487d2154a/34906840094.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a28d753e9ccd558f8bb9cedf5f3b6c11/7155806390.pdf
    • http://skiflogistics.ru/userfiles/file/853688914.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b6f62dd0---lukivamodededifuz.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/d9od94lhl5rd27m9dbgr774k26/kixubovafovujuv.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ordf7nqmkfcjqov85rendqma12/salofadamagilaniloratuzi.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dce9342f61c9dd96a2aa70bae568a9bf/17629811189.pdf
    • http://amon-syotengai.com/userfiles/file/dufifizak.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/610ffa467b6c0965317b0fbf943bc44a/xiguxebukizemana.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/u9mq2crva6r1ka9lbs2ikdqdrk/zovunuloxaj.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c44fd9699---wekifo.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088c04962c93---figenizepuvomaso.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/jasaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60f.bin
743ea3428639803a4feda22d3cc1d00cd817965eda9bf5be7bc1657e88d2dfa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 5428 bytes
font_01_sfnt_off0000f860.bin
54d67250609fd2a1c32916877fb52b95c507c5545ccb8e87abf311df1f12ca7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10712 bytes

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