Malicious PDF — malware analysis report

Static analysis result for SHA-256 9384bef1f44f79aa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 12:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e39f9feef611c435d522d822f03f157e SHA-1: 4aa272ccce350d7df96767bad83a04bb4c6a2b8d SHA-256: 9384bef1f44f79aad9982e4423bc56d76a0c29f607c59de795872734eefa8600
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable binary data, indicating it's not intended for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=construction+simulator+3+apk+mod+money PDF link annotation
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dc63a72140de41e10fb4d5e63c0c7b20/warukefevorenekunuk.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a890f595dc---nasosoninomodup.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/vovivusu.pdfIn PDF document text
    • http://calisnt.com/uploads/files/9525969831.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/fuvuxeriludufajonaz.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/mirivesovadagenejibevikab.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/gebujorivewejunizal.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gesafizalit.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/89371006697.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/29710539199.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/22216319982.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lgouinh1sfurhkoroici8ibeuc/63659039066.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/79d776b99975535713920ea396c5687b/81677300782.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/87319111930.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/mepugarujin.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/jukorevetaradar.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/36530954943.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914060116.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613805f13eb14---75429818690.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kh4uqn2m07solca275vkfgesbe/kufujuta.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ed2453446e8d20f18bd889253639c1ef/48250034376.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/mavevujofobegevabinuguvek.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2932f8cac8f972c66885f196bb76a87b/6126674513.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/88145288155.pdfIn PDF document text
    • https://dom-titan.rs/files/62441312399.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/13397804991.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35981762731.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/zitugewilunasetizi.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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 11184 bytes
SHA-256: 4df0b3f3e34ac1f66329ac38c6d41ed2fde6991a5ec89dcc350a1e6a3dad17a9
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 19320 bytes
SHA-256: 8ff834038805ccc2b4b46d11d1122d870745054787493bf8a2b05a75cbfa4de3
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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