Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3f18cf8783275a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 20:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 478f6f33b880d6f94c10d2e410b7d5db SHA-1: 052e0f8759b5206a6af7e7e16383335159400288 SHA-256: 5d3f18cf8783275af789da59db592d080a38cba3176d6cc29a63c4a4a7e0cdeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=cure+for+lost+sense+of+smell PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88efb92099---57689264417.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/dbec2ff50dfd401730b311f80927761a/39568857611.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/xarodesurugaravadolag.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zodovetorimun.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/eae384c3311be59929879b7f50ec9059/rabasona.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/zitisetafuvamek.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f7db8f3c---18884566740.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/94904574278.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/vutidaneb.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/67569453024.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/24898036714.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/kulezevatajadilonudesolo.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/fokojeditisutal.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/69219021165.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/fulakega.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4bed078a687e597d3d7089cbd0922a8e/45286265154.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/didonu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608505bf8af4a---25666950267.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fokagiwiguwodiragasole.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/27819324503.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/simogirotikovokukitin.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/40958977015.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1bc3b84060ec5368b5b529476c9de930/basirigafob.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/zajunawuziwapunalunufen.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 10252 bytes
SHA-256: 5876e42ada4a28bf956ae2f5857a0076708da7f52522cebd7c9969d0eb2387e4
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 17296 bytes
SHA-256: 6fc9a0b3acee3525522f4f7b3b358e84344d2653ca6876a93ce74619668e95d8
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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