Malicious PDF — malware analysis report

Static analysis result for SHA-256 242cc59e0da1323f…

MALICIOUS

PDF

81.5 KB Created: 2021-08-02 01:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b5263396635012ec5a49a444d3ae103 SHA-1: ab38cc8d7fd557c13f99165360242467942d337d SHA-256: 242cc59e0da1323fbd0b00d07d7e49e53ed2ad91d5bcf88693fcdec7e7f01b28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing campaign, likely intended to lead users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4309452e924bec3513f07ae4c3bc45aa/39625462185.pdf In PDF document text
    • http://kbchina.de/upload/viwanoweze.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/zamusapazowese.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210707_220338_8358.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/numalirorewozoja.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2604d31ae---devigixolanisazinojig.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f4892b8221ee4b55d6f2d4155086c01c/dawudifax.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/lebodirovojopa.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621153058.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/zigoguzedumilut.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/e6nap7gjgbsf49mvrdsb0a3ru4/bagazolevi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/vakokurovukuziwawomifinim.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c32bd84a2---warimanabukegike.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hp8vigvndi1u9omu0ffqkd171/boxakid.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/68909620039.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/42414093057.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/9918089983.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/45359118163.pdfIn PDF document text
    • https://somogyplusz.hu/files/61185991609.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098635be038a---livigubofem.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/sokokijonaxowivumopip.pdfIn PDF document text
    • http://0048.pl/48files/file/zeniwibexixoruboxefuluw.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/tonuxagumokiti.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848788f0211---golanepajivu.pdfIn PDF document text
    • https://fotovipvercelli.it/file/runonogaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=comparative+and+superlative+multiple+choice+quiz+pdfPDF 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 11288 bytes
SHA-256: 8dbee99b781c2030589c33a6176a8c63ba90678f6a26279702c0a66a529e3d67
font_02_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 16840 bytes
SHA-256: c3ce97465ff8fe3b9b85aaa74c84e01d220f8aa637c24dd0d2d85982e8a0dfde