Malicious PDF — malware analysis report

Static analysis result for SHA-256 b931295ea9e6a6dc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 18:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0594144cd078fc20689a40c2a17ad2e SHA-1: 59ac243440f831625fb9fea6e1e1e663ada796cb SHA-256: b931295ea9e6a6dc39f7d4ac645277e570c05472e0a6c01e5212ed61272a31dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links, many pointing to compromised WordPress uploads or disposable domains, suggesting a link farm designed to lead users to malicious sites. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=pdf+umbanda+de+a+a+z PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dljnmm4s3u7ek5nu0itfuna98p/xugiwa.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/31358802877.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/fojovuw.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/89131290088.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/62899397511.pdfIn PDF document text
    • https://strechybenesov.cz/content/67429447310.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/69508194085.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/pimapiwimixinuporabaj.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/91901836475.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349ffa618c---tutedatej.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezanitotowulagupopolid.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad4d6c8cb---81292619314.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/13019627312.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9574e4355---kofipuzutazamebosubilim.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9032ef678f099f7e1bdfa5755cda03ce/dusoveloburoxa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/bipokuzofipesamibu.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qlh6loo3mqdqffad1oq594hukm/begogawimakuri.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/30346691741.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/virid.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/309efe62dbc4429d132d7029635abf40/75704118021.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad160629be4---37641957782.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 10192 bytes
SHA-256: dbc58cf7e5287b4ed24d57356b7251115c0e422e8a825d3e8aaa5083291ebf97
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 19048 bytes
SHA-256: f5a91be7a4d38fb58abe3778c168bb1272f330680c9b045373cb698748c8cf04
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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