Malicious PDF — malware analysis report

Static analysis result for SHA-256 393fadbcda832517…

MALICIOUS

PDF

107.3 KB Created: 2021-07-02 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1311e0a35f544ec5be80235ca509d633 SHA-1: b00f397ded801e5cdd1409ed1fc8a061cafcda3f SHA-256: 393fadbcda8325178a15ec36170cbd0065254868e280a388d6d15f37ed62a1dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports its role as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.
  • 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://catamma.ru/uplcv?utm_term=resultant+amplitude+of+two+waves PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d1a97d5---govanibuxibapesunalita.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683de1f8f6---21066773132.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qmj0g9kqgqn7la4mf53m20pt38/56676193654.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160899b23f1502---56547928656.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mojizeguxutudepaxi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/c8ruvs0ghop1b8lgn1f7gve3d0/34325063641.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf87817d0c---61600017938.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f50947505---73441941350.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b390c1de6c---319601683.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/83cf372f74d869564bb19784b5901744/57041169284.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/59217641397.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8bae261c16aa4daab87db799999ef09f/38814014045.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/t540bi1f22p78iqdicsd63hpr6/42215952469.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/funuze.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/rowobolumewaruxugixiwu.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/78d888710c07958220828d1ba494bb91/vajisixunife.pdfIn PDF document text
    • http://yejida.com/userfiles/file/28470830894.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b398b8ee---36188792216.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ae5200a2---83179206211.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/70341832134.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/mituwakuxawivud.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/98354795644.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105131426187657.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pobas.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/5132257474.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160935174a6694---31353511308.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://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_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 19932 bytes
SHA-256: 119e878e55d9f7c5b8e798e3205f57a718914137b19b24af632fa2e87a039f53
font_01_sfnt_off00016ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED2 10856 bytes
SHA-256: f303c4e4b5655bc1250846deb53f7989ca2819fb6cf7b668e2971c7914f0a56b
font_02_sfnt_off000187f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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