Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e53b67bdf4f5a31…

MALICIOUS

PDF

97.2 KB Created: 2021-06-27 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5eebe80356195659f5c1939b36a035bb SHA-1: d0e08060e015394064a58b2cddbeec266f32faa3 SHA-256: 8e53b67bdf4f5a31d3c501dec1697477d83f567bed24c5e15f1d46a1c6d70f1b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites and disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://crysiq.ru/uplcv?utm_term=chicago+med+over+troubled+water PDF link annotation
    • http://tipiland.net/upload/file/tebanumozosutinavateja.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916e59c14e0---53247075075.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gajukamokuxelebibalibi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b957f8b9e09---dokeguxikakamasupo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7c6099c98196e93da273aadc70f7bed6/81199853673.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65686ac7e9---vuwutumosabiroda.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/903bec54b971feed8602a83621e3f0c0/55779004067.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf4253988---pinemodevuwekavodex.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/potafusuk.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/40884322717.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/280130d59e3055b2bf57db289223338e/sonevupigi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u84790miojq0sm0uli5lv97ra4/90552828033.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/adfafb3d86e89c65eaf9731a1ed1a6be/nugexopisurobogimi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/61814933080.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/22400077646.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb6670a1a---viravelufewifudap.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510112604825216g2xg4jsjmy2e.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/90480736229.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833c0902791---naxop.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807e600f4b7---fajemetivikubuladezokexok.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/39676072721.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97ac3f1220---sibikepatisebix.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/08f122bef4ec2cdf750ea6a7c1838aa0/94681355261.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/77968516973.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_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 10968 bytes
SHA-256: 7dcc8e465e4b67965886973479f9419b318d78f033bbb11151dd8116ec1688ed
font_02_sfnt_off000149ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 17364 bytes
SHA-256: c3af4ed9c7a853d3827fdc7be1a033f771c06f76dc4da5b987ec65e515f0774d

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