Malicious PDF — malware analysis report

Static analysis result for SHA-256 5120f4d0d2e9b364…

MALICIOUS

PDF

55.3 KB Created: 2021-09-05 11:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a8d6bebbf7beb76c98e61fdd26b9fb1 SHA-1: a2149a6e8c6f931f9b6dc4afa0ef8e560475a36c SHA-256: 5120f4d0d2e9b3645fb055305d12b8a3e3c953f17e9b6da322e93010026148e7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. These links are likely intended to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e857463705ab19ab6673a2e94a24bf38/9588930232.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zuxasitojoban.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sorawam.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6b084d2f---30796362594.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/4208669629.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/lolowoxogi.pdfIn PDF document text
    • http://marymo.ru/uploads/files/61290650456.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/gixumidifolojobeni.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/rugele.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/34073566777.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/gazorekawovekod.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dnnntt37m8j97kbs22fe0tftr4/lalinejuziweji.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xazusenopaseguv.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/71c6a21fec67e8c67f2e9301ddfc3612/57891245308.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984155e8cd1---motiwosotunijogovoz.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/nizizimofefewarolal.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/latawo.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/oi8974dipqqughp91h1jea5hmr/65011777334.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ji76gm500og5q1frjsdis93c8d/migefepatodobexefeke.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f4607245---54557415653.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/8818175119.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bobabal.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/31364185605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=comparative+of+equality+exercises+pdfPDF link annotation
    • 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_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 11236 bytes
SHA-256: d857a6359e89dadbc77793e672e4d2268d2a76c873dccdd167825559601ac454