Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfa6a4460cf5497…

MALICIOUS

PDF

81.8 KB Created: 2021-07-08 12:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87928f436fc3fae33e602011e4bedf1f SHA-1: cd8bd6ccb336422d1bd1e2720fcedf18034e3f5a SHA-256: 6cfa6a4460cf54975eb98b190fe9855fc8780b4570789c2ae9cf1b6818815412
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content or phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://infrive.ru/uplcv?utm_term=interview+questions+to+assess+analytical+skills PDF link annotation
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/07038960df9989513d587c8897d314a5/36466349171.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/purix.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5cb528df---75036417711.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/merozesuxan.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/eb42554ed96fe268dce1bc6ec95fd38a/dajenemalo.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/9690323537.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/jenilubaro.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/gofimap.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3743cd697724fff6eb945402cbed3ead/32761766518.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e801299d---xewakomuj.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0bc10808e---juxepinopeweropezefewupig.pdfIn PDF document text
    • https://activepymes.com/pub/file/getikudanemifotuwuxugu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/nq57265uugdqui7up544ip6lfo/80174598513.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1faceb0811---75027743521.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093d09b44ea2---bibefasaxodegusewekafe.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/68090305171.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0436fe21c25f162eff69053a61624927/42107433832.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5a3f17462fdfc255f0183148c4e42cad/63484510762.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/98057321362.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e851de0b64f5d956ee20b779b2364dd6/godubev.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25a64f3a4---wufozip.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/70843022664.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a292bf0562d---binejuri.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qmo6cebjioi937jq8scbftee1o/kipuzeluriwikedelip.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_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 16528 bytes
SHA-256: 8a45d294421714d4794e4ad203f2c5f831d9d42a265f993a918ae754b2cb7c4c
font_01_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 10776 bytes
SHA-256: f3830e9a396245395cafa8ae873cf87beb7cdbab06542f70bff48a45acad7c18