Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8745a4b2d7bd784…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 12:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95b08855dd1025ad51164dc6548d806a SHA-1: 5b2fb96a7804bc9dc4b3a26b8bf054611fc2aa8f SHA-256: f8745a4b2d7bd7843bf1acd4b8de53f68f48beeeaaa6d7b7e479b99a2daad434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://yingtailong.com/upload/file/2109010720197119942jssgssu1p4t.pdf In PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/depizut.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609055570ba94---3352202222.pdfIn PDF document text
    • https://aneri12.eu/res/file/56364534911.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/55863645726.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bb70c0f23dff662f623736b330753946/17502785745.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869d6c21693---96005043728.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/mevuzemepuselidemexaxe.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/tusuma.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ca407703f4b0b44ef5aba2bd040d47a8/14367744847.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/tetuxolewod.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/88442634997.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mukamevidaxuz.pdfIn PDF document text
    • https://emmaushuis.org/pages/69700340493.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/60444742011.pdfIn PDF document text
    • http://chieucoingason.vn/files/galit.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607413448389c---75353619846.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/27804401776.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/pamegoniraref.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a5437cef2b41ae6faf91df6128af23fd/zivaza.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f29a4b34ecbe3f54a006bbaefaf8eb94/34773438872.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0da88d49f---51441538765.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/51809261415.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc9fc0abf---tidorulakexokejiroxiduz.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/69136984579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=limiting+reactant+and+excess+reactant+worksheet+answersPDF 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_off0000bd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD97 11008 bytes
SHA-256: e7ff101a54eb80a5d322428e832311e1951e2340ddf4c8aeb55608de72fc0edc
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16236 bytes
SHA-256: 8bb36c3b04da05caf4787c0565456f38a7f4da7e4d934e0fb077ee4aacbd89bd
font_02_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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