Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8d71a5cc6951c9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1434a2612cf0893b5946852ea2ec755 SHA-1: 9096a51ae7e68dab682f856ba5916ea430f05211 SHA-256: 1c8d71a5cc6951c9cd807f13609a893338e1d5175e72f4804ea8e548429a2364
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and compromised upload links strongly suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8097

Heuristics 5

  • 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
  • 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://doanekeyes.com/userfiles/docs/vesazobabaweporago.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac02df0c76---44596083958.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hnjckm0j4gtaasv99eu7pvo16k/2935728439.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/kelemobatilofovasiwe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a0b00b36893d29d4a3c2f644e5aca60b/81119737677.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fetaze.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/fuvofuboxi.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/32298588409.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wovabu.pdfIn PDF document text
    • http://terminsk.by/pics/files/10316453088.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a577622c344---satorejakotinunanezu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8956cc8ab6f9f4df4dfeb07ab7c4fdac/zaboponebol.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/ditubavovifinoz.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021082208264473499.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e40f76dfba5960cd258fe14a2cd826c7/76320271911.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/lalidifavasubezef.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/81572384767.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jplh1kgk49vnedk11e1io9g7vh/70086196591.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c547816e1d2---95906830696.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/62bea091912d699b5a1295d292f8432e/30846287843.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/31172304017.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb70203832---29068518334.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/ul94q4m3r1lvot61qp6jq8cbgj/vesoranefifoxetogut.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/17344205134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=non+cash+contributions+worksheetPDF link annotation
    • 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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 10676 bytes
SHA-256: 32834ecb0025e8e9e5fcf23ad21a89c11b66a81f3be0a618a9d8f9afe8162870
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 17348 bytes
SHA-256: fe37986e22a9c54ed4a3cc426acf93b4e89ee78b61af5e28c53e575430a0c511