Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5afa43c1e3cc90e…

MALICIOUS

PDF

85.9 KB Created: 2021-08-16 13:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 512ee35d44575eb51f132a431fea9c02 SHA-1: 58236c7056fff7136e4903a9fb55ada717e83375 SHA-256: c5afa43c1e3cc90e533e7a6a6d04f0cc64704492f5c4b58b252cadaec87735e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these URLs are part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://starbox.fr/img/files/jejowisu.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/letedazenixo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/43310015903.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/jisezavemobajijanipun.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/afa8a74dd39c5c2942dc3786d5bf4bd2/58839501864.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/56082337504.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5574678cb8---jilumonebadefewela.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/24969694315.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3950482f---jukesipikupaniwisodovep.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/57694374176.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/16609532524a36698d1da1033ae04c00/65806711244.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/8834134865.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d62881521---7592437827.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078387c31218---89281194860.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/xorotal.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/46306042004.pdfIn PDF document text
    • https://nicosiacaffe.it/file/6541333210.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc6b844a1---40689474173.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/52711993360.pdfIn PDF document text
    • https://energooptima.hu/upload/File/77269451949.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nojifafewuwijuxepexu.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/sowusevexid.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/36036136341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=asterix+and+obelix+books+for+salePDF 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_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 19116 bytes
SHA-256: 3ca2078e74f259bebbf87ce46aad9723ca234e3cee0244c790ae2f69d6b626b7
font_01_sfnt_off00011774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11774 10660 bytes
SHA-256: 14d78ae7d0eef6dec2a46fa7c63899dc0340c46f7bad2b8e6c4077bf5670c418
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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