Malicious PDF — malware analysis report

Static analysis result for SHA-256 688ab4c0c1f8918f…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 00:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9506f450692893ade06cffa1202c0c6 SHA-1: a805a9acc83a0ba9ee50c8e361d42bad698b3bd4 SHA-256: 688ab4c0c1f8918fd1f0f6a6741457beccbe6827edeeeaf60aac8088be4b93a3
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, and specifically employs a 'remote-support tool lure' heuristic, instructing the user to install or connect with such tools. While no scripts were directly extracted, the PDF structure and link farm suggest it's designed to trick users into downloading and running potentially malicious software disguised as legitimate remote support. The presence of embedded URLs and the nature of the heuristics indicate a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef38b787ca---fikofujarovukoj.pdf In PDF document text
    • http://miskolciharsona.hu/pictures/file/41478978812.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/vejamenavunazarazi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/bugexilijesedavu.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39887982814.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/77463797132.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fa29b02fc10b291443655abbb12d984e/44391893413.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a9b73943---jexowobivigumuzinesapa.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mctqenr2hpcjm8ovqid1pj2pk2/36286118884.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/futekesefomo.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/pobapipovefuranaxawema.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/35898591721.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-8/20210808235418222108.pdfIn PDF document text
    • http://jaht.com/userfiles/file/tedisokazuwufemawu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/ruzinifekijabum.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/82807666812.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/losomiwe.pdfIn PDF document text
    • http://cochemical.com/upload/files/padalufejanatomunitulofa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f627a100cc---fevadawuwegofutovofijojo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082c932e2c24---migolixiworemirosipiv.pdfIn PDF document text
    • https://area5srl.it/file/nulukexow.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/7673120335.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c0dd12d1---budonajulanadivuzos.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/zapur.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/sidivofidojefa.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/lewelevabif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mapa+do+rio+grande+do+sul+dividido+por+municipios+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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 20868 bytes
SHA-256: eaa3afc46956290698d4e273975119b683af50aa9da8d8ff86d0bcf710e2b2bc
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 11024 bytes
SHA-256: ea6c471cd520b72f0c621f742c1e8839a9ed0def2d53b42d4fb067bbb66ae19d

Open this report in the interactive analyzer, or submit your own file for analysis.