Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6895e459858af15…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 04:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b990519bc0d416736abe7593b3cfb3b4 SHA-1: d52819254ccf70e46d6a3fa1062cb27436b6f4a1 SHA-256: f6895e459858af151eaae0a474fafe0c8fdea5f21683a20bb24e91220bf53caf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, some hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. Crucially, it includes a 'Clipboard command execution lure' heuristic, indicating the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands or downloading further payloads. The presence of these elements strongly suggests an attempt to trick the user into running arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=how+to+disable+safe+search+on+android PDF link annotation
    • http://ppfi-online.com/userfiles/file/degoba.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a8353f59---89348065454.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/9687497384.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/428882b5f952f24a9901d3ee347af7a0/bajexusadusomugemesige.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/toxitagazepuwu.pdfIn PDF document text
    • http://kvrhousing.com/uploads/42494559787.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109100649377010.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/55018607953.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/73672773512.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xesed.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/55057514739.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/92029650096.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161454cba70c16---6970259739.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/agta3et67nhgo7tpthd8num3j0/kitonunafakivujujo.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/navawozegubuzol.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/75809766101.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/zajatataneb.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/bewozijalutoguwerepipiv.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/wakonavaloba.pdfIn PDF document text
    • http://sungder.com/upload/lurufepebomorifotubage.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 10792 bytes
SHA-256: cf48f840f66e4f5475e605b40b47f840120fcb66e962da85c13e2992f9c0bd55
font_02_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 18340 bytes
SHA-256: 39f3d910d084d7c61d743b802c8965177a58c9c3c7469cb7f46430f85444e48c
font_03_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 17004 bytes
SHA-256: 1433fded29aae041a3fd2a7c201252c8006738d9b88bdf90fb1975ecd3ac5d65

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