Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21472e41192c5e9…

MALICIOUS

PDF

63.6 KB Created: 2021-09-06 22:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a2a5fafcba6ff8ea2fda810f3012c36 SHA-1: 5f918991fbbf84132704898c9caef71bd7017fec SHA-256: b21472e41192c5e951522ca238f3e6660bf1870a7263832eb79834f5023d8b58
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites or disposable hosting, indicating a likely phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

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.
  • 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
  • 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://queure.ru/uplcv?utm_term=company+logo+with+name+list+pdf PDF link annotation
    • http://gruppocreta.com/userfiles/files/83948642807.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2cpa2d4n5clhkfoi2rse8oc3kq/25753028223.pdfIn PDF document text
    • https://eurotig.ro/file/najanofololujusupegifujok.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894cd7d3c37---75596304995.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6a21aa0e75a81bd271a1ed1b5312c571/58614564328.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c661604c2---rexapabigowal.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/82336284581.pdfIn PDF document text
    • http://cityfate.com/files/files/besananijukojelamawu.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/pebugukejufumopul.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fofimagogarevilivunivixa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6rc2cpm8bdjpdrphh84atju84o67u6rq/gexelexa.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p55coa1n0aco93qjhm9f1mi6e8/bupukunatizoxifipeva.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/19873443640.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/latuwofizanupisinaline.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db279820f---7350628547.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c2a76cef5a2496f34737da40a9d5bb60/98756065955.pdfIn PDF document text
    • http://jarosi.hu/files/file/55276738033.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/63535692341.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/58508024551.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/070939082724.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/31056036358.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/45669108933.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa6ed6b502e78d262975d1db18e6311/2354821731.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d4d90788511d64d205a481a721854460/83481310871.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hij3ctajagsa4sboitp6k42ljj/88432624664.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 11076 bytes
SHA-256: 01228d9cab96b69816b8fce82407502a9056b029d9ed1491c1ef0867ef20b30c