Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc13abd6a2fa518e…

MALICIOUS

PDF

59.5 KB Created: 2021-09-16 08:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff6c533ae01a074484d52115c1d43fd1 SHA-1: aba0bb61777bb68865fa5f25d71096f530802bee SHA-256: cc13abd6a2fa518e9dcd27fae96f2b16581ea4cd5c12de0b32b97d92b53ef4ea
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, which likely serve as lures for phishing or to download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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://medvor.ru/uplcv?utm_term=mp3+video+converter+pro PDF link annotation
    • http://garagehayashi.com/js/upload/files/61705234532.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109021548416508.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c4fb95842d0dfd6cab1f0f0eda90bd1c/77117777882.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb34818b8f---64695641563.pdfIn PDF document text
    • https://wsbtitan.com/images/file/53276598318.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59374057576.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109140912578608.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/46717827614.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/72844043945.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/25829752150.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/93167973333.pdfIn PDF document text
    • http://llux.vn/uploads/files/67358027309.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/93604094.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jefijalogixegiwanupokajo.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kadivokosu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390eb7923fc---57032896452.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/55829235788.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sasekibaxisofe.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/59215688961.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/91118895705.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/gufigebulijuw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95kmn44ocokupqnapntf0c1l14/43083391875.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 10364 bytes
SHA-256: f3065ddb30f18a098ac15fe059ee27dfac5b373a062b0220754a34e01cdf1fe1

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