Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9d8c1cde868f71…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 13:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a26a1c3b3b4a8c2a6149563839137da SHA-1: 443712a1e4a735af7d2118ebf6cd2bc589811d66 SHA-256: 9e9d8c1cde868f7178a8c7d6f60c48020ddeee4c38371aa2a9a98ddbfe1d9af0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is unreadable binary data, but the heuristics and URLs confirm the link farm and compromised CMS upload pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+play+audio+in+mx+player PDF link annotation
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuzoboxoxenodalame.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109070557307460.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/84667799593.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/bupotabonewagugap.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/webibejoralumure.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/20901227268.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613291ccae746---41360973539.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/dered.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e3c87eebf---tisabavegomasolerazetaf.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/45922654920.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/57704968768.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/89552823187.pdfIn PDF document text
    • https://kawanmto.com/contents/files/talesepike.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/mizupuv.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/93065327465.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/febopuvexelalijivopulik.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210917152457.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/21371248c11bd9b7c4355e20226683b0/94612078885.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/91145467057.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/42624314570.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e499575f5---datisirope.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/51938467472.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/49100168356.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/46270098425.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zuredegi.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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 17660 bytes
SHA-256: 69b12dbde95ac9e45739734971ec7599b19bc06bbe960e2766453b7383552b3a
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10780 bytes
SHA-256: c141b9698293f5103d0f81e847f2a6e18c191da9ff432cd3f82511a101a3f213
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1