Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1e39df0ec1bc01…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 21:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43e7da132322aede5f5ba2d7153803fd SHA-1: b178b4837412bef769abc40034f9058a07378c6a SHA-256: 6a1e39df0ec1bc01c5d4645866dc83ba3d236a039684c36cf48a1b774d72886b
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to download further malicious content. The presence of multiple unknown URLs suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gberwanda.com/gbe/useruploads/blogs/files/91172986739.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7566130d3---nufesebogusojodalewuje.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/159d43f23472bf6869d5801a76385460/49556320880.pdfIn PDF document text
    • http://belovosushi.ru/files/68441549731.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/48989349469.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/daxazudegazoruxoledajib.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/redazimewomiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232f6d01ca---suwefuv.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/33386972885.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jimase.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e0c0212b---devisekikakijemaxajutog.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jemajuresozomisap.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/87913494486.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/79956385580.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475555d2982---74607713827.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rodbrord6n8r7v85bdohag36bc/gedivivowemijebube.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kaxefipozopifi.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210906_065947.pdfIn PDF document text
    • https://clove7.com/userfiles/file/11875783264.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/dekano.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/32385799541.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xufebekamivoba.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/27102892224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+mod+turboprop+flight+simulatorPDF link annotation
    • 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_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16224 bytes
SHA-256: 6ec3b915bda1810b0dd2def6988b2a5b35d77c41487529b780c6fc6820b33511
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 11140 bytes
SHA-256: 8754ce1ad048d8f8316d7727eb4fce1a407793b183f480311f36bca25c9a2985

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