Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9e2d348ddf67e4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 00:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a2555bfc2b4d2c0cbc7958044f77765 SHA-1: a0e117540694f05c2ae3b22cfb08bf5a2e2473f2 SHA-256: 8f9e2d348ddf67e453791e1db7501afd2f24b51c1d28e5f763a0009b5b7d6d09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads 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 distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 5

  • 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
  • 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://scoutpate.com/userfiles/file/divevakofogimonezalodu.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ddf450b6de1e9677c5cb2d436d018d37/jusijifezator.pdfIn PDF document text
    • http://rentaruedas.com/files/others/74023803400.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/947bacec909b564474d6eb749ccf7f06/fupewinuxas.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/69ehfkl46c66e71f3hmj44hb24/wutumujixik.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8v7kqv3bvhei0mvfdpkc0bl1a/49667643729.pdfIn PDF document text
    • http://lblussana.it/images/file/14260969644.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/4199996896.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4fjc24t3mbnebt6rrsc8eona5q/madivufisoxun.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/11958960147.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9c08479ca---2358292364.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/rejanuzubuwupefipotom.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/676bf5bc864477b730c3a6e5a5321b1b/23716233376.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/babiva.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19e46b7a3---musufovitabu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4570781---mufuwofedasa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bfcd0b885---2383094357.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/bodamupivinobijawabivumav.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210807123307.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840780deee9---31725624697.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f202c26e14---kokobiwebexonofa.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/fuloxuzifub.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/mubewalezonatuk.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/81659502345.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jifopapidunukaberikep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=portable+apps+pdf+split+and+mergePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10984 bytes
SHA-256: 089d4bfffd9802d2ad72c3a168f0edb4fbc0886682bf70a7dfde2ce3ed9c0b84