Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb7a4f11ddd3bb8…

MALICIOUS

PDF

97.7 KB Created: 2021-09-04 20:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5a88d511603cdcd7f8961f1a39c88de SHA-1: 1c2c8fd8e6b367a5a27bc0366a374df552af1f4d SHA-256: 5eb7a4f11ddd3bb8a60bfbb9d36dffad45b9710d30afb119c8baaa308ad613f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://crysiq.ru/uplcv?utm_term=positivist+and+interpretivist+paradigms+pdf PDF link annotation
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd233c40c5---lezujuba.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/ridediperamitulapoziwuba.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/63405874120.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/diwilenonimowit.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63295b806---82264003637.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/nikij.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/wemikatilela.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610a45c36e666---jafodovafinoli.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/sifepapinedesixinimudumip.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/8507582467.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/41345440042.pdfIn PDF document text
    • http://yuli-china.ru/d/files/kuxubexugitida.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f4d870afe2508452ec44be9f5dbc3705/14240317553.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/67319933842.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/takamodoxakebujaged.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/33120813915.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/xuduwasebovos.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/73445200129.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/0daaa8c8cd9bf1060b0610c2236cba53/wikitosifano.pdfIn PDF document text
    • https://bloc-immo.com/images/16830047834.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d307b88b98---96651468494.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vdv5vbhcpjbm4ugp47mnd92obo/zalavipewolazobu.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/baxufexi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 10860 bytes
SHA-256: e6c8406e279b12614ba1c651eabb77664e4460e0c96e4b959213dc9708266755
font_02_sfnt_off00013dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD1 19344 bytes
SHA-256: 26aed51dbb26feba8fb0aa0bc80b43fbae7c2ec475ae8fb0d2304ec10337ec14
font_03_sfnt_off00016f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F60 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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