Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6937face0e197ec…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 11:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2792781fd87c238c4597677ae86be810 SHA-1: 01e162aa836b94f883142b0312c818e92c0aacd3 SHA-256: f6937face0e197ecc3d4a4eca6011cbccbffd2d02d7df237669cfb7a180d49ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://honghow.com/ckfinder/userfiles/files/93826999132.pdf In PDF document text
    • http://jiab.net/userData/board/file/xalerata.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/51522392573.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/nedazekuvedofu.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/67773141219.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/59155940681.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/buzixixade.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/10002429139.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109090836129229.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/tupab.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997c120f41---mavibako.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/94234630211.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/zazugofekafibafidotag.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/244a86903fd8289d00f80c4bce7a9bf3/41528372942.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/pojumosuruno.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/24555873061.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patigu.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/97236432845.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137deeb5a1ab---viteluzuloxetolin.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/55894338550.pdfIn PDF document text
    • https://redac.ch/upload/ledikuxonakumurewa.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/20632381725.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/beranofoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kong+skull+island+123PDF 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_off0000b99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 10620 bytes
SHA-256: f65e55e0668e135e4c2325c2723090695907684ccb21715e5bf25c322827159a
font_01_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 16052 bytes
SHA-256: a2f630028fdaf519a0979c426feee5ed8c35b23dc552754579b5c4fc54a964a0