Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b6a19416d4b592…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 07:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6985b52fd539beb3e55bdc0c8fd7d4da SHA-1: 25c36e13aa6d501ab2c4ebdeefab933f7a4c74ef SHA-256: e8b6a19416d4b5926a1e776d9888ae35c133d7f42db6f06eb3911ec87d2465ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users into potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=acer+chromebook+14+cb3-431+user+manual
    • https://banghenails.com/upload/file/kokowerikaleradevo.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gubakudima.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d68dddcc---gasukerubamopigox.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2edc85879b0a7baa87345cdda34dd7b3/riferemifanuxitawugesexe.pdf
    • http://ghalemdi.com/userfiles/file/17253017815.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28698327a2---vofavipe.pdf
    • http://jacsonsfurniture.com/userfiles/file/tutodurejonovujuvoxusak.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d82111fe---foton.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/62377253604.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cacef043e---tefisidofi.pdf
    • http://kvarkeno56.ru/userfiles/file/35301364431.pdf
    • https://deniz-sogutma.org/img/userfiles/file/lafobexuwoperolofidipo.pdf
    • http://jonkmp.nl/img/cms/file/goxapivamipepimifid.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60234369182.pdf
    • http://birnagarcollege.in/userfiles/file/47818980372.pdf
    • http://lemma-studio.pl/userfiles/file/guvaxotelolevera.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a38641041f80b50583429601f71da26f/xujageti.pdf
    • http://dermaktif.com/imgup/file/keminasuxabedaw.pdf
    • http://rhondachem.com/d/files/gurokuxezuxinomubibufix.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/49015824848.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609037c30f5fb---wizaribunugelolij.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0c2cd6e910b1243bb704b8a19589a91f/54061557480.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/fezux.pdf
    • http://agiusfuneraldirectors.com/files/file/rinukapapizew.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17203258914.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca93.bin
45a971c371014a3592b61007981bba862e91529f806b4b283026ba0057e3b6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 18768 bytes
font_01_sfnt_off0000fb82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 16792 bytes
font_02_sfnt_off00011399.bin
d26324c0ffc08f8cf47e9b192d13ad39b160f2cf0d322f5a70541479a0113c34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 10956 bytes