Malicious PDF — malware analysis report

Static analysis result for SHA-256 b166cbbea9e8e263…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 06:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7239d6f9a22e8e49919c1798676e22c3 SHA-1: a47d0a67c8f778b3a1d092a6d8d60228adf330a3 SHA-256: b166cbbea9e8e263c218625dfc1b8263540d73e227acfd70b570cc237175f65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=fts+20+mod+pes+2020+offline+apk+obb+data+download PDF link annotation
    • https://senarathgroup.lk/assets/media/file/nesafevofurolesiwin.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/mojixawenodap.pdfIn PDF document text
    • https://network-italia.it/file/lobuvalijekikefononalog.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3d259f65ad2b593fb47579686ac2998a/gitobodozepuzodoviwigu.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/60177710729.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zazuxeb.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161391b501a8ba---nemilipilijetipudo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2d26e5ec---sotikazadarixufuzi.pdfIn PDF document text
    • http://zeci.nl/im/image/vasiwilizagov.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/76957729640.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zuzatav.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090516465958.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/57251305253.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9555914721.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/67547336927.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5abc73d396ea137cee85380375a48518/38947475041.pdfIn PDF document text
    • http://riviera.az/userfiles/file/nidevo.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/3573206516.pdfIn PDF document text
    • http://travellerisland.com/files/69856708832.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/pavan.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/karoregubifulujeguna.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2fdb8933---zufetevowuzujomu.pdfIn PDF document text
    • https://kueapem.com/contents/files/41394459785.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 11096 bytes
SHA-256: 4ce1b5dd80e02f259405411b145f8bfbe406c1a2ce5fee76af661f10e991363e
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 17456 bytes
SHA-256: 165095e0a1021250aaf47d58d8aab4b9ad0b310312bc47f368868483c9e15978

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