Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fefe83c740b9d2a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-09 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50749a0874e5d5fd8716c65db65bd08f SHA-1: a6b56339aa98cce0b0d0310a6d80ad1d9393360b SHA-256: 6fefe83c740b9d2a7179c4d47e2d1e2c3b6877854a8ca0ee534c0b1ac75cb3f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://ladachess.ru/userfiles/file/86176191377.pdf In PDF document text
    • http://na-bytecek.cz/UserFiles/File/bepitedosunenakani.pdfIn PDF document text
    • https://tckontrola.hr/files/92794152474.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e95e9142e2f678cc7f57883bbb8eee/65806153757.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/rusereteredujuvubamesevo.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/19431365980.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/41123383878.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/busenog.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/49782147169.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/62562361369.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/95223042954.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/50544068467.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a5d9ca17bc9cfc4e382f82c266590ad4/gavaraxewesijaniwe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/26964224176.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/pejidarinijuf.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/duweta.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jagovoxowikakolebagirel.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/1989928200.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/97166625757.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/vatogidola.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vated.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/kigurag.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/5915848607.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/kiriwajawawofisudowumujik.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613244dc1e794---40527868142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anime+theme+for+android+free+downloadPDF 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_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 20084 bytes
SHA-256: d47b04dae60352f64217dc1c9a7ad4a3ac0176666eeae11e7db333e3a6ba6228
font_02_sfnt_off000144b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B9 10520 bytes
SHA-256: f2add93a9a96f44eef0c6778f1593edb78297b6391c0995aa68291720f5c536a

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