Malicious PDF — malware analysis report

Static analysis result for SHA-256 6157c6d49e94509b…

MALICIOUS

PDF

78.6 KB Created: 2021-08-30 04:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 408e05e52e8489a93f9b9800b3e417e2 SHA-1: 9b6c17f849e386daa7013db56bfb3c085a8df87c SHA-256: 6157c6d49e94509b46117a9fa1044772d48bdf17f5e04f397eb463505742dfe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO abuse. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://vinacomvietnam.vn/uploads/news_file/60937459826.pdf In PDF document text
    • https://akvaguru.hu/user/file/78720904112.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/7534987993.pdfIn PDF document text
    • http://aps-mes.com/files/file/surelenetepowadufakepax.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b1f57a082ea179e33abbcaa5c92028ff/zirenurubenadadexiz.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/67049831039.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/17191318dacb402e47f46c8d399ad728/99468296327.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2e3cafd554c7001e40c2440c5c8768f/83690875561.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160727255aa245---77582838988.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/kugigefun.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobupiz.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/wowerukudukuxunan.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/68972386414.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/83b1o4r5jiitj2d6p0vf2o3mga/21350897333.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/6144067855.pdfIn PDF document text
    • https://medius.sk/userfiles/file/66338770432.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/75658998213.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1ff511b99---vuxuranogabikutawezijow.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d8b36dbd588980aad49bb5b983f31aed/48657756925.pdfIn PDF document text
    • http://bienbao.net/uploads/files/40500484528.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/00998803acede08094048cb62d9f66ce/wonegusog.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731f3a38fd6---26045951792.pdfIn PDF document text
    • http://candientushinko.com/images/file/bitiwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ginger+to+brown+hairPDF 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_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 17732 bytes
SHA-256: 08faec4cb6c96f1fcf1424f06b69c8a42bc958acce89e89cd124dae565fa75ef
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 10440 bytes
SHA-256: 44e8befadd2c692805feaca72c44268c80d518a413eb7dad9eba418171e72928

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