Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e158fc123383bc…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 05:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc946f28aaa9d57d782fb60fe2db7565 SHA-1: e3f50c3cf48e4ad5078a46ddf1691811ba1cee03 SHA-256: 34e158fc123383bc027ddaac8d1767efad54927aba6f7c2ddf59931ea65e315a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting sites. The presence of a link farm suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://sochi-vitrazhi.ru/ckfinder/userfiles/files/zigigexewevotawowuxasi.pdf In PDF document text
    • https://museuminiaturesbesalu.com/files/kemopakanududil.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/98002857493.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/46776612577.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p8m40ccgt80092e5omklrh3lk9/bekapemab.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/fibafoxeg.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/52480284363.pdfIn PDF document text
    • http://ozari-ua.com/files/file/zewuzubupu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/94406411044.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/ludegozasu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/00e79133dc1ceb0e76d3b9a2dc96776d/10659154414.pdfIn PDF document text
    • http://aven.su/userfiles/file/11377494105.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/93741086108.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/96038638837.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160706f187b9e2---79075001202.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/39539238763.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/59012755598.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3b560af0---zutupibobukowok.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/woxiwuzekidedezawiriwas.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/27740894581.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/guxiperoro.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/46583365665.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/vofaxasisudedo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/bobelej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=noclip+for+geometry+dash+pcPDF 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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 11052 bytes
SHA-256: b86356045d1c6a27b5bc0d3632f2692a4c58a0e06779c01a3b287f1412d8b675
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 18608 bytes
SHA-256: 0277f7f25c9e9b045891c8c0fdc1d3a4cfc3fcec517d981f1a65863efd3185c5

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