Malicious PDF — malware analysis report

Static analysis result for SHA-256 850eef45a7e21b93…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 22:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43f4483aaa1c0ddf80e890dece107ec3 SHA-1: e46270ff981519760001730f4c501d1e9b5bbfaa SHA-256: 850eef45a7e21b93ddbc41a9a7fca92adb8d78387bcf7a7d1e15fc664ee7dd2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://sanzmendia.com/userfiles/files/74398826477.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b6be859de53ed2f75839195a2c1a1c4/rujatuboke.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1386eeeb3---nudopevuwonerojixoduka.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dccb2823732cc2e316772f6bef2a4962/juwatikunotigidiwelomodib.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609aced00a---71420214206.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/aablvgq2kob3c11c78tjnihvd6/bepetujoruvixodupuf.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/79041738376.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/69260594318.pdfIn PDF document text
    • https://cooperspick.com/files/jepukulodegerufuzututa.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/pagunarodemelinipoxalo.pdfIn PDF document text
    • http://fatename.com/uploads/files/202108221109071890.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/mofexidelividuxutazurixo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f4edfc71585a69df63f21b395e2a815d/57860467871.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/38082391544.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf24a758ea---91847462112.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c100558e4c0---bifozu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/kuziximabus.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/wovexiwekujoludazavenub.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/5590690612.pdfIn PDF document text
    • http://gotween.com/userfiles/file///roxarifonidiba.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/25548747045.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae249e922f1f8622aa2c840f1d35c475/jitetususubovuvenolun.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/91225985702.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e02453e9e67---83585649766.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae172584---xurokezilowak.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/daximamuleta.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/nafidonipipuzone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tesseract+ocr+java+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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 17492 bytes
SHA-256: 4b0246d477c1cc27da1d7e49c0991303325f2f4e608c62167bc58a8063b7ac53
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 10528 bytes
SHA-256: c95d794cda2716446da3a0dff8acd3b7c5f115413850eb0c28946b25b6505b71

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