Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d66fa099821c8d…

MALICIOUS

PDF

70.9 KB Created: 2021-08-05 02:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f1dd8db506516519dfbc1a02789dc5d SHA-1: ebf4703ccf67a4054bc7232ceaf16f685700d9c6 SHA-256: 21d66fa099821c8db140ceeddba39e25108347122bf42a49d94938148f23b8bb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links are likely intended to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

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://pixomot.ru/uplcv?utm_term=why+is+my+air+conditioning+flashing PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7d2f11ec2f9573fa13a56550ce74680e/wezuvafipavaparike.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v1kad706ceuj9sf95th6560mi3/21256904439.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/lufivo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/83073663864.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6366ipesb9l93ehbq0hjisa43r/papawisosivuvevekelu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/97593102003.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/55310726899.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/3573618344.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52ce7834a---84468329509.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tubidebe.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/188498698.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/levodogetaxubefexorobiw.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/81679627250.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gr0ld4ibo17gtbill3r361dnmj/gokedenesuradenanisugen.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/sozugesukajobaso.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/70269666259.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bagosawutoxaji.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0673b2fab---37276656549.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/35434423984.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/rejelit.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7u51psed08h7mfb3uhpmk8vpu3/47474890270.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb5ad1d542843a65879b1fa4a3760f57/8516666862.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16248 bytes
SHA-256: b21acd68995c83780f05e5e1ced3eb515e386dc7393f6bd36fc8fb5eb27fb8b9

Open this report in the interactive analyzer, or submit your own file for analysis.