Malicious PDF — malware analysis report

Static analysis result for SHA-256 b478fab8eebd530a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 13:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ed1eb29c74f50ec2b051e8973895d6e SHA-1: 802aac3241d7a78e427e64187e45ef9f963e3531 SHA-256: b478fab8eebd530aa5c09370be4e0a175bc0841760761ea8fefc3f73938dcc80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress uploads and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cycling-software.com/files/file/sopusovuxudi.pdf In PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/20561760990.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/81282132896.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xigewovokewigerifaju.pdfIn PDF document text
    • http://195exim.com/datas/files/95266987322.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/52766289214.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dce1676ffd2cedcca492d5ba41500ac4/77565304443.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903185419.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/82286821002.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/mivirazopovarer.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/mojimokuxonaman.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7mm0umfakg0uajcp2no2e81b2q/kusukubilibinepo.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/somifubisezot.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/wakususiso.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3f624c3---45533661995.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/12271038858.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b50b13785e---61351574259.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/56428211058.pdfIn PDF document text
    • http://getem.pl/files/file/zigir.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318fd0c5842---55706430665.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/36006150459.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vomumenofijinegetapur.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zomoditidatekiba.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/46280453962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=extreme+car+driving+simulator+game+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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 19816 bytes
SHA-256: 768d36c80120e27f2ce0ec9dc0b0fe9d1cf8c912a03f8618c592c42e349b7949
font_01_sfnt_off00011746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 11052 bytes
SHA-256: 8edf3b8bc8c67545276e168bd3017ca8fa0f96927d129b6f9de63f029707a92f
font_02_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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