Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bfe4e1bcf3d138…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 16:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3b497fb1bc67677af945cfaece261c8 SHA-1: 5629e9ece88a3e13f5c750e04f7a84ab9504f57a SHA-256: c0bfe4e1bcf3d1384ceb41090aca8e351f386ae7463f39aed4fc139f872e30ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories and disposable hosting. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=love+ni+bhavai+full+movie+watch+online+720p PDF link annotation
    • http://pospatrans.cz/UserFiles/File/tupafureteranusove.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/68kulut2v5lmo2abfsu55uigc0/dikitejemijoderaxubari.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/kawewavu.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/sizifabodumona.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/63e94e4c1d38d284e19ffba67d2fb3ce/jidabijef.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/lopudulibedew.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/69584754712.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/zalufezumixevijirolitan.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/105e6ee7a577f0a8450c30462398c4db/xuxefijifilojolivifonitin.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/23502036424.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/kazewepuxelokowakabodadal.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/tugigikukokazavegise.pdfIn PDF document text
    • http://evola.it/userfiles/files/62197111548.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/91589894930.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ad0ccdc9a8eb56ff472ff1d0042cf409/mavemozo.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/kulutijagawumimuxanalexu.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/mulowiwanumomipatexujo.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/doxagizodaxalipud.pdfIn PDF document text
    • http://space-edge.com/upload/files/18840429726.pdfIn PDF document text
    • http://momsystem.ru/public/file/komutudevu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/rivejonugi.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/27777159696.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/puroxuwu.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_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 17424 bytes
SHA-256: 5949735ae752db7232c392829f27dd6a878fd14fa4e269e0fb165a7040591c35
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 11120 bytes
SHA-256: 70f30f798b9f5862eee4c2203b71122ab548298d75c3bade64af41cad7850eca

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