Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6e070e68af1863…

MALICIOUS

PDF

54.2 KB Created: 2021-09-26 21:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4d35d54a92bcf89e2cccbc1bfae64d9 SHA-1: 6b53647424c9c53e12e6201001cf5b799391c414 SHA-256: 0c6e070e68af1863235bcb9ebe6bc29938572770ace76f414d5574dc9d69c8aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is intended to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8111

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://crewmak.ru/uplcv?utm_term=delete+duplicate+contacts+android+phone PDF link annotation
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tuwonira.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/kabezofisiwadofulezipuz.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/xapetazifamisi.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/jamonurivufosadavune.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a6e2556c7add6a622333b4b370804567/97074812311.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/lipisuxiri.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/dogizusojizozumukonu.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/lanikewiloxaziwag.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/wafebebapuzakajopaj.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/2735269467.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/99485105001.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/dibek.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/18942056443.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/60857271362.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/59818884025.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/nanatovuvefosixexara.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d842c1e94c---katetarus.pdfIn PDF document text
    • http://hydrem.ru/images/file/gujoxexamezovidomojobomiz.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210922191718.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/33232633473.pdfIn PDF document text
    • http://ippon.lv/uploads/File/nasiba.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7e39071ab82eaf1dd4a7e1c765fa270a/mofulanojajudobisazuv.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/88639484256.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jejiraburebotivep.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/66940874510.pdfIn PDF document text
    • 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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 10712 bytes
SHA-256: 17d8a9ecc1575555f360464a2e76f271a8450c651a4f26b12db7a38fc7463bbb