Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7b357bda6ac89c…

MALICIOUS

PDF

89.0 KB Created: 2021-07-09 06:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 146ead0d4a15167b70d0fe666f640a2f SHA-1: e0172345f6e2f0935f1609114cc06b6052ab67e2 SHA-256: 8d7b357bda6ac89c3e9f4e4f292591cd93a8be83629b003806723c6a21f89624
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

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://vistobrasil.net/uploads/file/19674502122.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c894e6e9---duvosasewazosof.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cddfe8d55---77570481316.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e8be9c99264f77bacf536405c3f9b43e/pujadomog.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f67ceceb---tumolu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68b6687a40fce232e8836245aaccc565/leves.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be013e30daf---56270746306.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080876b80e45---6271783572.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160909a246106b---vozapuvolunodafeged.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/75148946100.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dle0l3jm712tckjbh2rgcfi780/81591243883.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b046587991---40883338563.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/rowetagonin.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c34fb2854a785c798df5e4979ab9bda6/zagaxerapebimipun.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ade48998c---xexenubujutovo.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/38626742548.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pigipijuwa.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/76157830463.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/41670097661.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42a2949b945420439e0feb07604b4d31/ponovafinusugokux.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de15b2f6a---fulubuvogoz.pdfIn PDF document text
    • https://codecs.ro/images/file/59283735688.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/sijepilewupivalezuzazanu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce84f2d3c6---18507065968.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/51415839714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+how+to+fill+a+map+with+commandsPDF 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_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 17156 bytes
SHA-256: df6422cf729646e7ab71eb590c1f37ce7f345a7bec14e3df4edbcc828942476d
font_01_sfnt_off00014e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1