Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8628d1cd88e47e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 09:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f7b97258c5a858ad7a3dd9d441b6684 SHA-1: cf9af1290e3a29dc0bc7b2b18a33b3b00247ec91 SHA-256: fe8628d1cd88e47e0e9ed1669862c871c67400a6fe7e02dc724d78170b88d0d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to potentially compromised websites. The heuristics indicate a link farm strategy, with many URLs hosted on disposable or compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://park-seversk.ru/other/js/ckfinder/userfiles/files/wizaleri.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133258e4fdac---jajikobabuj.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e58d3a307---11470680174.pdfIn PDF document text
    • https://preciseenergygroup.com/media/mafogofadime.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/20212285497.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/roxezu.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210908065641.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/7187181858.pdfIn PDF document text
    • http://17njl.com/userfiles/files/17803878764.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/rulavoxup.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/63581016237.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/54737398378.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/fekerewox.pdfIn PDF document text
    • https://arerp.kr/data/file///nanol.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/pedijogexamef.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/gisel.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353752a6aac---44065111143.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/fuxelozisifaxoziwoxirixu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161453dc3dd138---86831604438.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/89195322073.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wafipunejapinusenag.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/60601368917.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/23765739658.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95598564128.pdfIn PDF document text
    • http://zzquansu.cn/d/files/18116158033.pdfIn PDF document text
    • https://tepihtrava.rs/files/dadajijuruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+bottom+navigation+bar+examplePDF 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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 18496 bytes
SHA-256: b1068e0cad08ef88f88d23744e9729cc71503e7562a2424392af183cc8f26f5b
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10856 bytes
SHA-256: 6c1cbd8e50c640fb9233c45f9a2f95a881b37eea009196208915ab4fd7d6e393

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