Malicious PDF — malware analysis report

Static analysis result for SHA-256 b769eede5249cb15…

MALICIOUS

PDF

81.1 KB Created: 2021-10-06 09:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 353be40dab17076a09b3b984dace88ff SHA-1: 44b142b6be9c84aa26b2d3bf83b59cc57920d6b2 SHA-256: b769eede5249cb1555d17d4f3b2b6b25f0ffd45d088f8a8739a6060697ff9ea1
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as malicious and by an ML classifier. It contains numerous links to potentially compromised websites and exhibits characteristics of a link farm. Notably, it includes a 'clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The presence of these elements strongly suggests an attempt to trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://ketchas.ru/uplcv?utm_term=russian+currency+to+php PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403832708f---gexovejebaratinofoxokoso.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/laderoraranilasinofixogu.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/volusofuvexolegiz.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/tadinoruzixawitoj.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/73067022848.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/vuzasinakatokuxi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/7582031912.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e56e26ddd---11745754542.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/jadelewelefikeguje.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/xerurisamipomoboven.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/32363752754.pdfIn PDF document text
    • http://tianfonmm.com/d/files/pogarezimilegivuson.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/68167862483.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/nogesekot.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/remofazavomazujerodanetu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fa4a68d3dc3055fecc61e423b8f3a7e8/puseziboj.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/50966925557.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/furanovemexasegikizo.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vejavoxubel.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/34855616855.pdfIn PDF document text
    • https://wsbtitan.com/images/file/52394294297.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-10-1/20211001021103243408.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/bamuridemowadavivo.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/93049763198.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/1221451961.pdfIn PDF document text
    • http://moristas.com/userfiles/files/72219087609.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_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 19896 bytes
SHA-256: 28d8201afb8f4b4ea0ec46715f03a2622d912ccb022b10a284dc7691944ee505
font_01_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 10684 bytes
SHA-256: c24a3030f9edca9b04c1e3f5796e7f13fc3076205423690e3fcc7be4557bf4c3

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