Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05c1cbfb3c3ad60…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 12:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4ee7b47702112d0401a8c4baf5611bd SHA-1: af28a3f8fa0f01c8dd3631aed64dc7bcecf2ace9 SHA-256: a05c1cbfb3c3ad603ee1a35a21e945c0e60ab3b87509c7f8a9e0a2542b18d78c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document employs social engineering tactics, specifically a browser extension installation lure and a password-protected archive lure, to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links to potentially compromised websites, suggesting it is part of a larger phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://krisoc.ru/uplcv?utm_term=free+pdf+decrypter
    • https://papiratisk.cz/soubory/baladoripegawawomasibe.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb49c4b040---38554416095.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe5b2d8c7---gifadiraxomoratomilowa.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/85f05f3b39b54382bec969c6c39b1358/joriwuju.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/64f652ee93956005a94afb78e1a3a829/fipanuvix.pdf
    • https://chmelo.hu/sites/default/files/file/zewexabudazoxuzaj.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/20ce2b224fad4f747c4ae88dd227da68/sarenajefisamunigux.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d08ebd7c1---71209280897.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc22238cd---vorofure.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c7f9c17f---86765849258.pdf
    • http://to-tuong.com/media/ckfinder/files/mezedofotazi.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bf7ce80e5ee39aeaa8fc5f19cbb53529/45772856076.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4b2153ee---guronigibutedawowuxefazo.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b12c2e59c3ff203bbc6ae6c68624bfca/bowidugaredutegen.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1dba347fdb8a14f4aba1698bfa7ccda6/womaxunokasugam.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075804f0e2a2---85444025029.pdf
    • https://hophamthaibinh.com/upload/files/zagezomarutasi.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5f0d8436---gibufumotepobin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin
3c82641d252f9ad14cc7ff04a9cd863e4d9cb12a148ab540d6226aeb27d9835d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 17556 bytes
font_01_sfnt_off0001125d.bin
893a83a6b6acdaaa81b081373776526e280e7d647898b7e11d7e5132069a3036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 10012 bytes
font_02_sfnt_off000128a8.bin
c2a1b9ebbd1f99c7f6e2487d3ab5a8b464e9e47dc7fb7b4b1b0af54d7e7622ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 16808 bytes
font_03_sfnt_off00014033.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 16792 bytes

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