Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b7f0bc26de534f…

MALICIOUS

PDF

115.1 KB Created: 2021-07-23 12:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ef388ae49ec0886e2ef4f055804be15 SHA-1: 365bb2e05a438a58d3d58bd0a92000439df3a907 SHA-256: c3b7f0bc26de534fde0dbc29b30efb3abf6c0659b99692bd1783b3d6baa4f0da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/62007e2a1ee8903e35153abb4b2d10aa/86717763370.pdf In PDF document text
    • https://namratalakhotia.com/userfiles/files/91907326861.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a37398ed7a2---fanukotiwonixukudubir.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2922fc57a5---32519634685.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/setitugonolaradixi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/smv3kgffvsa9vs3gptobomg4a6/kunetanutosi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/38cb4d22b4766ec9be5b1b28f12c65f0/fifisep.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bb8dfaa6f1a7329cf6d9c5d565c40732/72098290188.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b4539f80173---43741881277.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c7b9ce35---13934756288.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6cf1e982ae297548d91663e7311d019/44049222255.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/gonawusafufasiwimalunuj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608352cb4dc4e---jubosaka.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210630154633.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/tunilapukutenos.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d076a6aa1a---wivep.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bq05u63ookhpm6dj1c48e88k02/16872943802.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/88174588672.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/7390293095.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lafiwijare.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/57840884409.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/be47bc4e7eb473fccaf4e5ee7c357e9f/gefawidenevugokonokosona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thanks+for+watching+audioPDF 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_off00015fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC4 10820 bytes
SHA-256: d29212a834600e158802c3db44c75d1767f36d30a4cedc53936914c82b597ec3
font_01_sfnt_off0001788d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1788D 17260 bytes
SHA-256: 09c250206fada80ac649fa73e86d58117a4dd5a10be8e05ee2c6651723ae723a
font_02_sfnt_off0001a5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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