Malicious PDF — malware analysis report

Static analysis result for SHA-256 441553852f3561d3…

MALICIOUS

PDF

77.9 KB Created: 2021-06-18 17:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ddd9e34202e64abf80eb7acb04ee8e7b SHA-1: b2435cc92100f469a6746eba96a3b8cefb921e5f SHA-256: 441553852f3561d3b7738bed9d424003f93bb9e774c58c95f2afc3014fc6d4d0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to execute commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5f95b0e0---zitefobazas.pdf In PDF document text
    • http://fundacionecla.org/resources/original/file/18949318103.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607876bb4f7b7---wudaweza.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v5o924a1b4m4e4ochpvi9pueg3/mumovebavugol.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/per7s56mkku811hioei2ofr869/8196269775.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/pewusuxeno.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f462a0a375db36e6041503c936c83a6b/kagujorugafalirun.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc27cf02f---temubopuwi.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tawakidenegasezazizufatax.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/90d4ca1c7266917a0c8dcb7aa46a60e8/rozoti.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba17698ea---nasolesupimawefabitatet.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/galisojotonurir.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/jojawodenutemuzasafiwe.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/97373479238.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e77b5c45f---37899071573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+mp3+mp4+aviPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 4824 bytes
SHA-256: ae4d7590ce6634471e22ad99a9171ad97d85aff8151f743297f548891dbe9e7a
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 11168 bytes
SHA-256: 571be9bfb83b8caabdda44cee618117ec348e54e6f5ace24e3142178dee64984
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378