Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc6d511074c3691…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fc28642dbf4597687be2f22fe5a8e90f SHA-1: 21afc0e1d288d0f7dda72958e82fe99dd791a095 SHA-256: bfc6d511074c3691b8809dc678cfa6cf61dee533d003966f14010da9ee9603bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://skrutit-probeg.ru/upload_picture/file/zoxidomodokirij.pdf In PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/17400549488.pdfIn PDF document text
    • http://ktcz.eu/files/files/39019036223.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/16306761984.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/99266477929.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/06a5e0411f2bc7ecb3739ac30fa90f94/59505506426.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81a60928f45b7714856582c66940450/40119451264.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/28603655678.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b151b1a93---79682538842.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kinubopozobujila.pdfIn PDF document text
    • http://enricobarraco.com/files/28624291876.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec7b9d9ec6---54011722002.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/21089012096.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/genozinebetuwifid.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d93443db8---32065548948.pdfIn PDF document text
    • http://primaneighbors.com/userimages/15805874049.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/pimafewenafodikinujik.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7fa0cc07681bc45e85e72f78ff48636f/fezolanutuxejofexa.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/sugiv.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/58586958273.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/lazavutemunawa.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/77242836838.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/fajamebigewajilubeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anatomy+and+physiology+pdf+2019PDF link annotation
    • 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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 11268 bytes
SHA-256: c1fdee2d10c40170fa241345365ba0b7158f98b7c6060f5ef53ca5bdd730ef33
font_02_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 15888 bytes
SHA-256: f8b858d75d368f1073ab7faa7257b7b1d7e778a785fa47cc3abd7cdc4fefa207