Malicious PDF — malware analysis report

Static analysis result for SHA-256 a496149f46bd94ad…

MALICIOUS

PDF

71.9 KB Created: 2021-06-07 11:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b290b8b1b98cd8eed2d4f8576964287a SHA-1: 5f6b8c9a6086526411f8ac9287836e508c49713b SHA-256: a496149f46bd94adb642235be68913f9fe32d8403be61aacc4b6371d6b483ddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'watch online' lure indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=alone%252Ftogether+filipino+movie+watch+online+english+subtitle+2019
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb018ef0fcf---tilajejilewukevo.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec62ca7b8---xufasor.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f17382e43---zerenutalevimakuzuro.pdf
    • http://plncse.hu/php_data/file/wojanibamowo.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a265355adba---dosaxizifakid.pdf
    • http://autoscuolauniversale.it/userfiles/files/73934734710.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ef3942ec---38733076760.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/pg16kaer4fk3spnett0q1sub0t/43397539325.pdf
    • https://avigailpekelman.com/sites/default/files/file/dolaziwevoguzuzibil.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7c42b061bd3a0359d201822d5037536d/varojixezanifoxisuxoxige.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1ee83c6b---94879037601.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3adb4c5c65045a514eafafff0e02273f/50803146568.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e02f8e7bd---53477471706.pdf
    • http://danfilenemd.com/clients/67744/File/nofetebixaravelagufa.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd94c47821---finagozoto.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/mamafo.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_off0000d891.bin
c90935a3b092e1728c7894fd8c26e6118e3e264e751e9b5a43d57583d6f04401
pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 6228 bytes
font_01_sfnt_off0000edb6.bin
0e604f689af74901916e09a857b385ab984a41e4f848dd4deae8014694cd2ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 10696 bytes