Malicious PDF — malware analysis report

Static analysis result for SHA-256 830a01c8be5a22d3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 23:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4226a7d1dc2e669059b1693a6e66a9a9 SHA-1: 3637ce0cc7eaf36790235d4376f3f05e2353e9ee SHA-256: 830a01c8be5a22d39b258b10f5f016adb52cdabf4bc59c386b791bba60e27b0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=where+is+bluetooth+files+saved+in+windows+10 PDF link annotation
    • https://istocdukkan.com/userfiles/files/bipuporuwomoxakaxokul.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/69570549611.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140da0d2d77b---dozigufimujikavijolej.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/werobalixawobug.pdfIn PDF document text
    • http://zimmerei-possert.at/nasovarafoma.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a0ccd7f5df2a1494ac0deb0210d67864/jawevivuzidorojubelaj.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/86301614964.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/73550142599.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2987574956ac604400caa08f9ea4c56d/wunutezamofedex.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/20946887116.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/posurosizafiwaximix.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24541188973.pdfIn PDF document text
    • https://egf.tw/test2/images/file/87509233888.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/pidenamofopuxuz.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/gebidagomimivusarig.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/46158468221.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210916_4FC076726E10DA81.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/satenabigikaxufosu.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/jadedepifunuziv.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/nivajapovuwijij.pdfIn PDF document text
    • http://chinalabware.net/d/files/58138871852.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/talokogatonuvegigojif.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/bositemadelas.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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 17808 bytes
SHA-256: ee4e2cb5cbcbfbd7d89d175c04068ed77ea5a5b25154d43882dab8923b9e1fa1
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 11008 bytes
SHA-256: cfe06b345bcf83a6ea5b3c39d63ee8b16b8060f483fbb4e90b0fe2d934efcb85
font_02_sfnt_off00012e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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