Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3a50befdcbafac…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 12:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e896ab2b5862925750f1c284ce4c3a6 SHA-1: 8fb1a7e614212ecc55b8d4419e2ceb31cf01d140 SHA-256: 9e3a50befdcbafac4b963a2145c74133bb42d9f19c8ce233161faa7f49ac52c9
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ibconsulting.it/userfiles/files/kitenux.pdf In PDF document text
    • http://langfordfinancialservices.com/userfiles/files/94826918381.pdfIn PDF document text
    • http://premium-t.info/files/files/73418074266.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7s8kdh0mevfnfgj8m2r535tvpn/nekovubituponumutiropij.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/56767674064.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd36b3c824---bugefekape.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/butajewube.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/73606433925.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/81850434463.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/4200157999.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/917099111.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dofonafijuvaferodi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b44954cef55---posulatinosolisoxi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54a8f4eed9893347f0ad5c29f2ec4078/wuvoziwokojelozolasa.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f14add9d8a5871c0b05c2e82ce4a480/73808118454.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/ribetigekoxon.pdfIn PDF document text
    • https://stotex.rs//files/10872004645.pdfIn PDF document text
    • https://ancoraeducacion.com/images/6733433915.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/76538856041.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/sopemeten.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/59836130276.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/95736108426.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/mutixores.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=health+education+journal+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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 10772 bytes
SHA-256: b5a142a0af51c7d71098e111693b8b5c622c35ebf6bff9acd61ddaa6899839a7
font_02_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 17652 bytes
SHA-256: c7c0e4273364ac0ee8019cefab81a5b53d3402ea2b1b61250e8eb6e80918a0bd