Malicious PDF — malware analysis report

Static analysis result for SHA-256 454cf5aea6b54157…

MALICIOUS

PDF

116.6 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: 619792f368224c1a15b703f83f23c006 SHA-1: 328cbc1a008a161d9ffffe33d1a057c728b91023 SHA-256: 454cf5aea6b5415708d39fa4d53051fc9301fed2e74f75f38fc845fc897bb6bf
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 0.6465

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 2

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
font_01_sfnt_off0001a9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9BA 17632 bytes
SHA-256: 0dedf0fa2a46bed92ddb02426b5e96a0cbf561926c842556b3e19d5b16894e95

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