Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4fd3ffb8c43613…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 01:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20b16b35e11ef479e261a2f396a21c8e SHA-1: f59cdd783c1eda8f1c293da3e6a7d219d0e08bde SHA-256: 6a4fd3ffb8c436137ac797af17c93396a607b5d01256a710f39986ea51ee5034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggests potential exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://emannsltd.com/userfiles/80993620472.pdf In PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/40703606489.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/68480811714.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/15278901415.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/wuraxafapope.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/4357895912.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3fd33abe---libufix.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/mirukadakamomeke.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/28304373551.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nilupo.pdfIn PDF document text
    • http://turatabor.hu/media/26753588411.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71279729529.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3cfb74063d0a62aac824c6285b678ba/zuzomazutabomanoga.pdfIn PDF document text
    • https://raljob.com/userfiles/file/tumodexomojadubejuje.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/10026219124.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/95828273986.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1391d5256dbefc519c46a9c6b45f52b5/61830606216.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/50498655777.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9a16a04---gotigun.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/nnin5lv64mqk5dulvik99r0847/fanedidadokinefigexodo.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/depozimanunepofanu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9c5d8531b50a4e9b8b952d7a2771687b/14326940067.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0706ae72aa3d524ddc0b289bb5d0fbc/sotoduximedazowivof.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/koxelapivo.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/mipapaluxanurexuj.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/45193822616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=meditation+101+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_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 18828 bytes
SHA-256: 63aba5b6f2b2745e08e3ffe191e4d38450beacc0b903a62f4793f464e32a8bf1
font_01_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 10344 bytes
SHA-256: ee179db834d3e809bfca69f844f6b075deba9ae83274fc252e2e83e48c1bcdd3

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