Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a659e3ee3b8b9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 19:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a28c2466eeaaa3ef5d30a7eb6000317c SHA-1: 81ad53e4241fffa8310a7f453b54f74a28badb65 SHA-256: 7a9a659e3ee3b8b9abe6d472cb44f9611ed453379b54a94494a19fda4e21fcef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of 'cmd.com' in the document text suggests an attempt to execute commands, likely to download further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130180070de9---83776785145.pdf In PDF document text
    • http://csc0532.com/userfiles/file/20210906224822_iuggfn.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/46465498594.pdfIn PDF document text
    • http://qdcmd.com/data/files/gopujaratumekakozoku.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/54042737792.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lokoviroboxuwovunuxem.pdfIn macro / runtime command snippet
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f08b7570b---14372961632.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/zaxupifimemodujijagavim.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kozofewumejuwefux.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/mejelomonademibivavasa.pdfIn PDF document text
    • http://manenshop.com/upload/files/12481919168.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95e298cc---sizosekoxekokasur.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf81af907---15353554130.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/22468986581.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/43063656419.pdfIn PDF document text
    • http://kasand.com/userfiles/60124187231.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/14651270761.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/xitabufowadulaxezololafe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/80341486001.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/67068006589.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77269338164.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/63061919720.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/70779885170.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8kuhsuhfc6c3nhff4n50kh6me7/74177296831.pdfIn PDF document text
    • http://healhumanIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+live+wallpaper+free+apkPDF 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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 18408 bytes
SHA-256: 9b81d4ba7bd493bba34c0f59a7938f71c8475a5135c16ce2dea98057aa50685a
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10332 bytes
SHA-256: 35b8b0a71c9cf76704d61592dadb5f0e336d0a5d81b438ac27c6dbe97fffccb6
font_02_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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