Malicious PDF — malware analysis report

Static analysis result for SHA-256 24007da2d22e4aa4…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 11:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36a93a37b26180f77535261ea96f71da SHA-1: 9c86bcd06ae74fd266e69423ff0230cda1623b93 SHA-256: 24007da2d22e4aa4614e237d62328afbd4abacba4657cdcc947a0e414acf58d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=telugu+movies+watch+online PDF link annotation
    • http://kesherisrael.com/uploadEditor/files/kofuzatakorezapedu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/suxifutunogajizuwuba.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6a4f7f403b84041b077d8cd75a6f3fe3/86674400145.pdfIn PDF document text
    • https://finliz.lt/i/File/sojomapelugimilotugob.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ralulu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gasopokizobedamitotikenod.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/83286350586.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/5465745915.pdfIn PDF document text
    • http://dd-eng.com/files/files/69792410468.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/lifekefuruvobim.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sixogafikok.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/81996669434.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/mukozosoxedepuxe.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/dufokuvug.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f3b415ce4e2df5792455754a9f266d89/78021521518.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/174386955.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/lavakireretiwexafitaxapa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349d1bd79f7---7868338857.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/6184732765.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210909095812_wapcv1.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/jakakapikepu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/radodoruvuferetotazavifar.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_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 17596 bytes
SHA-256: 2a4dc120f2e3fd8ec050d0bbbbc7148ec8c9a891e8875840c4700ac1c8dc069f
font_02_sfnt_off00013c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 10792 bytes
SHA-256: f71664bd510398f3dbd9ece066d6a305f825effa749db1cef733b5e2dce30d66