Malicious PDF — malware analysis report

Static analysis result for SHA-256 352f33c629f47c5c…

MALICIOUS

PDF

71.8 KB Created: 2021-06-02 18:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7d6b4eba52ac2a43c9af0d6d961b1b SHA-1: 651df31ee6452dcbd2d77e7a583cb4a193293ae4 SHA-256: 352f33c629f47c5c1c5e6b54199059ccb8199a43db8cde36b19f02c53b7731a7
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body and embedded URLs suggest a lure to download further malicious content, likely hosted on compromised websites. The presence of multiple links to compromised CMS uploads and disposable hosting reinforces the phishing and malicious download 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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cb1a4a44a51c240e3b95365eb8d389e9/lekelifari.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e866445824---62804159976.pdf
    • https://service-panev.com/userfiles/delitoku.pdf
    • http://shuswapladystriders.ca/userfiles/file/10528364025.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/o6fltjv6nuie8b872gnl4nevm7/fedobemazava.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607130f3c6722---zabuvuxufafigulaxunebe.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ea654c01bef3c10676f15fcc015a081a/24952690873.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/97761794953.pdf
    • http://veraschwemmle.de/fckdata/file/namenubuvojozuko.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f676b55850---14721000489.pdf
    • https://uleiuri.ro/userfiles/file/3278458388.pdf
    • http://bmcnx.com/userfiles/file/36286408245.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089db4845a42---remejinibafe.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7d134b14---wadepepuvu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3563d9707b---fifupogofetakixexazuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ver+pelicula+alguien+tiene+que+ceder+online+espa%25C3%25B1ol+latino
    • 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_off0000d67d.bin
6bb4c27523091aef707ecd51bdd4b04e9fa8cef76cc51ef6a47ab5a3cb38cb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 5544 bytes
font_01_sfnt_off0000e921.bin
68f5573316c2c9296aa2f628327ef30a98a0685c3fa219a542866cae470ee175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 11704 bytes

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