Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bda2f8e28d258b8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 15:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a81cc76f177aa3dac164ef9861f4e4af SHA-1: 101e10493ae5ec49a4164b613331eca87df7a466 SHA-256: 1bda2f8e28d258b85df8f1a29f580f3eb90ffa5c930bc996e37e30eb838a64f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially malicious sites suggests an attempt to redirect users to sites that may host further exploits or phishing content.

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://garglob.ru/uplcv?utm_term=vidmate+mp3+video+downloader+app PDF link annotation
    • https://pmsp-me.com/userfiles/files/jemeguvigefaluzu.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/xozurusozivavimexazutob.pdfIn PDF document text
    • https://aspirans.com/files/file/9420061056.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133eac6c8ac8---60526063193.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lidokisi.pdfIn PDF document text
    • https://cityface.cz/res/file/71679664023.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/99601906266.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/pepijupexurate.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/fujuzaj.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/60443545098.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa92b0b68---rakegaxanagokeji.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/darexevafanojenivulek.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/mowoturekel.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/49832564832.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/64711055915.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/32273391156.pdfIn PDF document text
    • https://domilot.com/uploader/files/45847407063.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/49979308799.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/12953256069.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/tesanot.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7b0bcd64ea4d8eb2010e0ebf45d1d561/87953501562.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/66074499285.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/lerotadalejofelufoparo.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10676 bytes
SHA-256: 06d28f4f256b73cb5fca6cf38779e439582b9bddd09bc1dd1357f936112b4ae0
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 18152 bytes
SHA-256: 5ac78ad567b0dfcb7bf0bab61f4c1a2dffac402248d7b98f731452ffa59786ba