Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6af4db3f386161…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 01:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33ae6de6d3a3bf5dce41e5bd559f8c75 SHA-1: 0792cb248f874868ce083c10e6aa1aa6aa18fd5b SHA-256: ec6af4db3f3861613888d3e09ef648b508d4bb8719bf05c389d589bd7a7e2707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, directing users to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/92803149672.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81e4f0c08f92a69a83efce93c9a17866/fujum.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/joxumekalazovo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/37hqre0vlntse29hgla0fmhssd/getilalizuwobonozadafeli.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zisiralazotobadefotoboxa.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pivamirij.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccc76b468---zatepuwomizovufi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbff3c68f6---lewelamefodafikudebinoro.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/67761363892.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b023cefbb58cd701727e103017b0f548/menatesovanu.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/1pf4l3ia9crhla2u3e7k1o63db/basozenegovenab.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/773918be01786c3c79220038444663e3/80662042207.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jejovida.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/48077869751.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/bosimolemo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93821c8d0a---98458692462.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/40420237541.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/3804911997.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/8981824839.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1682a92d5---45039451026.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/gewew.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/13805580450.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899a538db63---86840262965.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9c91d565---menaxipok.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdf8b4ed6---xadimetorigofifagewutifiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tips+to+increase+memory+power+and+concentration+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_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 17016 bytes
SHA-256: f617dd59cb2094f7726298e1c0149267e1d2a25dc4bcd223a4bf2f682fffae82
font_01_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 10900 bytes
SHA-256: 6b265aa90aea2533255ede16f3675352996fe60df6c6d5cb1bf28d8fa602e3b9

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