Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fceb25f3fecb8c…

MALICIOUS

PDF

66.4 KB Created: 2021-09-08 03:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a6feee85446f1a322366e651aec6b50e SHA-1: 8b9863a45c70302f0355fe8bf8b31807f5f3b745 SHA-256: 21fceb25f3fecb8c5860fba6570421f400c0c740f1b219f3da3e817e5f58c6d7
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 0.7731

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=foxeer+arrow+micro+pro+manual PDF link annotation
    • http://nyitotthaz.hu/userfiles/files/difurazuk.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba5a18332516e55aa3cf9acde04b0e47/zenekopejerususiliru.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/japujedukemo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0abb476e---xakabage.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/kupite.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704abda3cd0---vavajexa.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/renagemexipuxibulopowut.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/cc0899deb4e30afcee2e31edda6bf7e8/wedugiludoxopumeronejediv.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/3670976521.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/72894068704.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/okil3ovsu3k0ebrtvh8eag7n91/1582122697.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a364798d1e---vevudu.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/rodowejik.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a057c4b5c---nuturuzurotejizivezemikan.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kukomikepojipiduzide.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91d05bce6---68898518398.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tlbc1gtrl7tr8givf7sq73er81/girewevofav.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/namalodogexaxopif.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63c7b0641cb902ebf1b3f590138b8eac/54845057513.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/86148178935.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f105f3e9ea7---naligono.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lelebidezuxi.pdfIn PDF document text
    • 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_off0000b490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB490 10536 bytes
SHA-256: fac80896a7aac5eafbd8074f4d4b2da6b9b5980371e3b753b946b346769cc3ed
font_01_sfnt_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 17964 bytes
SHA-256: f0098b5fe10e7e5150becdaeccc5a30b9d8393f5243c2fbcbdd2ba5cc64674fa

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