Malicious PDF — malware analysis report

Static analysis result for SHA-256 58046fdbacabc407…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 08:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2019e2c60aa53f5c80d689a9606148c5 SHA-1: 3593a855e82ed5de5a0cf6dfa516dbab63127183 SHA-256: 58046fdbacabc4079396dc4b054fd658175b848416b9fc20e94b9505ae326345
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple external links, many hosted on compromised WordPress sites. The presence of a visual download button and the nature of the links suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

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
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 17152 bytes
SHA-256: cfb4237b86bbaf3ef3d16b57cbe937b1bafb0cf8aa8987f06fea3d3d33c84311