Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0aa6cdaf4c340a…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 03:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69347278ba07a2c9f9e7589129811503 SHA-1: 3b265a457cf72e61ab16ada74ea9b6a3a255944f SHA-256: cc0aa6cdaf4c340af033cb50a41bacc108ccf148cc30432e4ad3a14f7a19d0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous 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 phishing or malware delivery. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=android+strategy+games+without+in+app+purchases PDF link annotation
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/vabipojemid.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/beseg.pdfIn PDF document text
    • https://svltv.in/userfiles/files/xedera.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/reraleva.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63b4d059f---5881668647.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/28868203696.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/73126152494.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/wavivu.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/50686472987.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77f41991f---ziloxowatikizotizije.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/lufirazefikazitozozaseg.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/xupozi.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/vebubemawoxetizimelejaba.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/29971838088.pdfIn PDF document text
    • http://jonme.net/ckupload/files/19700414079.pdfIn PDF document text
    • http://regmac.net/userfiles/files/38019796873.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zamawejifalawefup.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/24266473278.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/mezasiribesafemagaviki.pdfIn PDF document text
    • http://snsi.jp/image/news_file/37962353759.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/27196349486.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/damowudejivulajasalo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fc536c0b---lakikudelu.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/fuvawu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wukimobukiparemu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/88280699176.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_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 17408 bytes
SHA-256: 93cc08fb05b6d554d017db49b113c67c0623fbb743d54d7ae1aa212c2057af71
font_02_sfnt_off00014117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14117 11196 bytes
SHA-256: bf56853c56d7ae54a663a66a41a6d809b55c4d0896a08293188c266f426dd91f

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