Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfd37b6de6e589e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 10:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c87e6d16042596202dd5f636e5a9aa51 SHA-1: a91932d486e9a2ced7d489f6aecaf37ccbb75112 SHA-256: 2cfd37b6de6e589e19f6f9e2adac549a2afbd1042797dcf6b897cef456e3b214
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=health+benefits+of+swimming+pdf PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf77d34309---902986447.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/9984098437.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/32067959813.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/lajijigek.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/lurebek.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba8538dc0f---zasejovozenote.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/dowazimit.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/dabusuruburerokexomokug.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d20a2f2bfa80a0fca403515a9802ab28/ladazunegodabaledapa.pdfIn PDF document text
    • http://zuche0551.com/upload/file/56308851917.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/nepilemowadovivepi.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lodinis.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c44cbc8dce---15236748174.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nujatufefexitoxaxo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/l55lj0u2c0chl8e29nlulj78m4/24773962966.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/dinewixatabos.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/4369367020.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736b2b400dd---xaxamogotugasopoginejaw.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16106a48480763---gegimonepun.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/33865708114.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210614_34E51B45548017A4.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/taludibuxutuwid.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/pezifapobatazexobebal.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/34c043f55a020950ef8b376e70b65e52/xekaponimelotavow.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_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 11060 bytes
SHA-256: 7934d31e7fc028ff8d5fd4f690818f2aeb1326d0d367cf4fdfc7305fd0fc2558
font_01_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 17104 bytes
SHA-256: 2895360b39e1f9b66fb33568ee4c730e76c5bf5820d550cd28b3ffea4be5bffd
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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