Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e30cc875e00708…

MALICIOUS

PDF

111.0 KB Created: 2021-08-08 01:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e10410715a76027d9c71122854a28381 SHA-1: bbdb4a9ab3ef212d03633fd0c39619c239a4b490 SHA-256: 36e30cc875e00708d4079b549dc00647e207d32e8831460771574fe095a52ff3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites, likely to host further stages of the attack or phishing content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7540

Heuristics 6

  • 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.
  • 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://chokysitohang.com/Uploads/userfiles/files/98611703379.pdf In PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/2401438446.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/watamulila.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/fikoxuribopeduza.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/84859848365.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/74676870206.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415159cfc4---42152933684.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8rbigdp89d50kksu2ha9r7kk9q/45712899511.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/zunuxelodamifuvezelutot.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61013d1b54---75692366767.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/54437d7fe62829bb512a264efa7475f4/77887499541.pdfIn PDF document text
    • https://led7.ru/file/tafitilanofudadidizidi.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/buxik.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zetagipalozunufagosot.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66fc71268---rozijuluwiwefetafi.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/62120403712.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6901e1015eae55c4fe02242ff39e59d6/geditatagogusujowa.pdfIn PDF document text
    • http://samtekelektrik.com/files/47079848293.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/xalegexavesatuxu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4cba7a3d---repilekokep.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6959d4ad0581c0965dcc9bf2efd8638a/zukotusimagikedorolesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+difference+between+roman+and+greek+theaterPDF 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_off000191a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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