Malicious PDF — malware analysis report

Static analysis result for SHA-256 8169e5cccac8f531…

MALICIOUS

PDF

84.5 KB Created: 2021-08-25 10:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 74ec5ed579a2e5d63434ca163f990cf4 SHA-1: ccf6ab59acf8ff3683c489074ac4989ffff84971 SHA-256: 8169e5cccac8f531be6ee94893f03336d49d1a58d2d6e91bed881e70dbded92c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://alakharia.com/public_html/userfiles/file/21175342166.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/nmr5b2n53fvcfup8r5dv1ludso/mexokipevula.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/nemixoliwifibu.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/bizatedabivomewixikadari.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/mibonupor.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/pabalulutofawunib.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/33f538be3f2e6dc76d00775fcd5e83f1/93520718743.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/elc477f85uvf9vcspae5keq6f5/45508806767.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/65767529939.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nasonobigasebiwavobojinu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ljud7ufugn5bm5gu84hs85rqeo/tumogigamir.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nugogaralagadomefowi.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/faxovutefesejibusigi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/lowilivorawakojaxelul.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099787a678f8---45341247858.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd1d9a5f06---47591195381.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/situdurikojorivejijotope.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ebb6b2e55d77a78c9d5ad81b60cda851/15157368270.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/85728084813.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/stigsa4ukkgsok2gj2v7of8ol5/32168934462.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/powopotefawibeve.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/54655662648.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/viket.pdfIn PDF document text
    • https://digireg.at/upload/feduvibiveguda.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ab5e39649ebf5635906802ab10a6236a/36978681598.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/7572b3m14801s0knvqued02gvg/xugidazunabuzojomabat.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g5m3tt0pr7r5b02fd09rk0ago2/7470886918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ace+inhibitor+cough+treatmentPDF 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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 18116 bytes
SHA-256: 2831c00841d28b9a8be72651c99d1e31c57f8ef324d7c7d827a11570f1198b72
font_01_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10684 bytes
SHA-256: 8e86c6a4a2c5623da6ffeaed56fd3cd7628a0b8fd7c915e4395952cae4e30759
font_02_sfnt_off00012b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1