Malicious PDF — malware analysis report

Static analysis result for SHA-256 524223e4308d2a3c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 00:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fddf371bcadd2338d447c5fe8774a7b SHA-1: 6a1f5fc73463895d9ebc233e7f584e34db0bc9ac SHA-256: 524223e4308d2a3c3844b64bd8c6cec4b2d39360440f15954ec364f5ca82c563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ba8e013bf---83085917205.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/k36tugd6a0a35b0smuuk1ptgv0/32126743324.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfacda6b0c7---fifadukadomazavanezeke.pdfIn PDF document text
    • http://slsnn.ru/content/files/25454743016.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/3250113513.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08c6749d41c89374cb9b37f86f70f2cf/36442455608.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/wogoloroxinonu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/140054324071.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/3cb83c4c2b6d8707f90b06872e9942f4/22382251126.pdfIn PDF document text
    • http://djapm.com/userfiles/file/1201138721.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/refozazapedixo.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210723092702_1011945473.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/78231371452.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8d2e95aa7a3c37771e8f88867132aa6b/zoxipaxenalajexiviwu.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/37034645528.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a07133f22---tebuzexaxum.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9c46176e---pekugi.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xopanamewesojakegakova.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ce72480ef82de870c2f4b5b5748982ef/mexif.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2055eb26---98282871701.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/95535948160.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade2db6ab94---38310576307.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e227aa1fb8---togogexo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/886072eaf2b9de8fd6fdd31796a01f30/28178368083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=temporal+motivation+theory+pdfPDF link annotation
    • 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 18736 bytes
SHA-256: 11edffbdf906ad8b68368a768c74efd4aaaf8602eaec07d83ddcbd843a0ecd3d
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 10740 bytes
SHA-256: 44f626592ccff7a2025c2e63ebd511f42d30de7015750ea5e2549a85c12fc7b2
font_02_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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