Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a1467c1fb25185…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 20:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 378174f6dd3221fd696d358982548e2e SHA-1: a209a04c2e163b1ee2740272748bfca83e964985 SHA-256: b7a1467c1fb251854bc850d800fe1ca62fcc07ce6b7f7519c5e78c848d74c5ec
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and heuristics identified links pointing to compromised WordPress sites and disposable hosting. No scripts were extracted, but the overall structure suggests a malicious document designed to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=hydraulic+power+steering+working+pdf PDF link annotation
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b634a6d2212---zinavijid.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f30fdca63f70eecc59eb4bf156d1d0df/vigowufiberir.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/10028934651.pdfIn PDF document text
    • https://palet-school.com/files/files/98948672471.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/suzijemewuki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c12383e0---56140558398.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f057c36f25---42701694137.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcfb457a2---44537751731.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/vodete.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69378870777.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3ee90a181---72442208267.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070814060333.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fef327fd41---zevokizasanozesagogaje.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607db80c3f9b7---wizutudubenokunewowade.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c08876416fc---roxawekuwopimawal.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/radepujujizosaposeke.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/26066073896.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/leviso.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/79653384020.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39facc8e4f---vuwoxakujokew.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/talojirituwugunawozaxi.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/fuzonadofejerunidebubavi.pdfIn PDF document text
    • http://flomojapan.com/upload/files/kivuwijoxafasugabozi.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/98261060511.pdfIn PDF document text
    • 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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 11176 bytes
SHA-256: d5ab479653a27e1c8922db248109dad0ac5f6beac2ba04d00471815e2fff942c
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 16984 bytes
SHA-256: ec73260c309c6b51a2b19e6393450102ed2221b4206e802dbb3dec9272451a4c

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