Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e98082ee86e556b…

MALICIOUS

PDF

75.0 KB Created: 2021-08-30 20:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c96d3c91cd8d76adb2937af801a6f92 SHA-1: 1c1a58d854d6f7a294e937607b706d3afb206d93 SHA-256: 8e98082ee86e556bb97832c0ab8e0d846c7632e3e593aa6f8b5cfc90975ba052
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8596

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://nomylo.ru/uplcv?utm_term=percent+composition+calculator+by+mass PDF link annotation
    • http://kaizenlife.com/ckfinder/userfiles/files/11560270157.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pefufemezizugaxeberajol.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/lebuzisitozipazopi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qrs2vuvk4f4q1kmkhdol7dq8kl/61453394713.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a24e1152---55783529577.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/17648654656.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612171b1e9a61---75674996268.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/aqeubrnoko9bi6bf3h0jkbf9m2/28897377766.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/jafasirofabazubozobazum.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e503317ca---lebad.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/53785377503.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108170354146803.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27f81c88d---potapizujuwovi.pdfIn PDF document text
    • http://jaatkinson.com/userimages/38508803259.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/jisobutiwi.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/fawogosafav.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/gurij.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/enlc11ltj89sjknl3v1mtv5uh4/35644472135.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/paxexixonaxesasobetumetu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160888343a7943---samewuvilu.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210721084343.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b38995fba---galozosip.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/61423003371.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a6263407---gagofetomenazinixuxazo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55a0314ed---nukuripeveganafunexaditi.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 10892 bytes
SHA-256: 96fa9af06e939124520d41e65968aa7bc00fcb33b1c0a84585de7c18ca20463c