Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6263fdad1bbb06…

MALICIOUS

PDF

86.5 KB Created: 2021-08-09 05:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bbbaf04da0bcbb7e9758cc1a88dcceb6 SHA-1: fb67798f0e6a990e169c257bbea18a5ed843d806 SHA-256: 6e6263fdad1bbb06b7539c0587e2a9a76a5599d303a48bd45f27f2724abf4bfa
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The links point to various websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.alex-vasilkov.ru/images/wisdom/file/kufinaromunororosexe.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/30541481611.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/73227188303.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kesabodukutaxuxofafefefiw.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607340b1f0bba---59871152723.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab5c5b075---tasogelibupugedakomoto.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8661e87b---38823212163.pdfIn PDF document text
    • http://renovator.cz/files/file/9379808094.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/81128432976.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/nokupel.pdfIn PDF document text
    • http://medi-sen.com/files/files/48106512618.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/42414856392.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/bisozejipegobabelaravu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6unmh0u57prh69sskaa0117ihr/nakaxalazewolen.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/xivanunobigas.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lst5sj5be9jr3agkhq0k076u27/tojosutowosol.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/5392238756.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/dafazazij.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/39rd2rsohvbug095g07qlvdcgd/wirumurujejaseriwaxate.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa5a175303275e788adac5e516e2e6ab/52274611772.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/degawuzuvururavi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/585de9545b75b3fb07da1646c23607c8/jupemewajisufavilowufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=youtube+connect+with+your+spirit+guidePDF 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 11008 bytes
SHA-256: b661ea3283ebb5622e85a6fee5bb3125ff2576d9a6e754f0e54d8302360c9638
font_01_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 16868 bytes
SHA-256: 5949e02743882677da3e295724368300b6d56674ec5c22e75c9a509c07c40f7a
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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