Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6c36cb7352296c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 22:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd6543adf9be137531f6fb9f12adef6c SHA-1: 98d149f185a910b87389695f1962116f83ad160d SHA-256: 7a6c36cb7352296cfcee3c9ccf260c3a934f592fe64e15c2ebb967e5f246b9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or phishing pages. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kochitaxirental.com/ckfinder/userfiles/files/magaletip.pdf In PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/jujogoka.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/derazojevibi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9c2707f55---643940681.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/53002032406.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/25540677837.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/sowekeg.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/28815906187.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/42397222195.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140670147252---48218063361.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kokijesejokere.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/runikilokemobijok.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/budepelirisizoxujeparoxi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a8261d37---66799318590.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/88977594466.pdfIn PDF document text
    • http://grimastone.ru/files/55489725895.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/80302434963.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613250dd41bf4---65622390052.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/vaguna.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435e8caac96---64885001518.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/76059531168.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/93198896205.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/xalofuxikidebu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/364d8f8d3a358252d9376b331bb21c4b/60366312305.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16149b2e8950ea---zikop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tamilrockers+2020+downloadPDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 10816 bytes
SHA-256: 22b3ab652e9c62e4b52879c4ff24f842b97b047c2ea2d69ec4c94ca2bd2dfe14
font_01_sfnt_off0000cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD74 14272 bytes
SHA-256: 6942011f54ea20860163c7eddacc6f7673ee5c777c04854439bd7aaff11224fa
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1