Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20a02c65a849c39…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 18:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b54adb9f14f0b0c68eb0cb8adf5c97ab SHA-1: 71f74a169ecb77b7e912d938b2072d9532f2e9dd SHA-256: d20a02c65a849c393d69c7fd55d30fcfc447f28c468ef59ccb4db3d14a482a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be directing users to potentially malicious content or phishing sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=private+instagram+viewer+no+human+verification PDF link annotation
    • http://mariondhuique-mayer.com/data/file/fojenabutofizowejobabuxek.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/neloxatowakusulisibosoduw.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/zirus.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/16724911774.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/75533870177.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/tixixibekodovimitiderab.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1dbf78c24709db129cbd15247e54f741/24130052337.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///vifilotafitu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tojeduzivapekev.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/gatabuf.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/44676f8e482222376e5ac574eb8dda96/rawuju.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b9494664aaa2b26849e07b5d27de3bd1/fidawujesikigojedo.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210901123204699.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99c058cb1d0023dde3354e4e6bca4eff/tarawidebojolelubotomuzuz.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911225422598642.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/posebib.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kejizib.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zetezaditudatagodexajofa.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/nivadogobisozujo.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jomiterin.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dutis.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/30578494228.pdfIn PDF document text
    • https://andrejc.si/files/file/36646539799.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/64682096307.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 15780 bytes
SHA-256: 5aa38561f5bb2a982e3aa5a8ecacded688e4ea1819b61aa08086c9015565697c
font_02_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10988 bytes
SHA-256: 089cecb44e2f57b0f1d2d17af4eab83d4cb7b366550ac560d3d674340f3d0584

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