Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5095bfa4a1cab6…

MALICIOUS

PDF

100.0 KB Created: 2021-09-09 02:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5249fb26afe3f3307688f5f1772506b SHA-1: f438a29d27c3ab71ca483d5bfce2b912b475a0e1 SHA-256: ec5095bfa4a1cab65efec29fb03660416f0f9d2622356525460649c041b90e57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to redirect users to malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially serving as a downloader or exploit trigger.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=once+upon+a+time+in+mumbaai+full+movie+download PDF link annotation
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/61959667721.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/27178876169.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/66416569038.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/ganolime.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210904020106_1617214342.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161389ff894204---rimagugag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133427b36143---77560708772.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/48572155319.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/rexusutifivibugexoviwuzad.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/47311748469.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/xukeworojupej.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/37296930960.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/21417087751.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa61d97a46650790483166d395f35c46/mavorudol.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/palatebuwe.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/12261080260.pdfIn PDF document text
    • http://unsersohn.ch/images/file/97494687335.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/6531939084.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/rajugute.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/tonazulon.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sepaxe.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/70363032378.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_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10928 bytes
SHA-256: e58b47f4de03a3dd55a8f1a116584524aaacb32d55f24554a96166adc803a05d
font_01_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 19612 bytes
SHA-256: 87a259d31171468f830f30e75c3e3710e0632209ce92fb95a66a2a77f442e6d3
font_02_sfnt_off000169b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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