Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c24e57bf337ce1c…

MALICIOUS

PDF

102.6 KB Created: 2021-08-25 12:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a71974ca1ed96d78adfe0f7e5d6a7bc SHA-1: 221695058cd951262045050ac5ab8569aad56b22 SHA-256: 5c24e57bf337ce1c3428eae48d014dab182a482fba352eb58409e4d3fa05ef19
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 heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites that host further PDF files. This pattern suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/d4d77c3fc9813d30e08322b97c3626d5/fekuzi.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7377d8251---bepon.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/743543625609beaec631ca.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee026dd91---kufusamisiwimitapakowoj.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1p198nv5ro5lo05qdi2sc32v0p/75741916119.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/ziletobigofigonem.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dc4af0cb---51746350996.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee6f7b541---33874317456.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a10fbd5413b17be774e29ae71776df82/noromexukutatanefawaka.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9fd8e4a4057ad0bdf0798a6e36457236/sawepas.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b741ac5bac---wikojegomu.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/totape.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/99210625816.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/4818865366.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/22817984660.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f5e53ca1---mamolivolaravotajelesa.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/798920020.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4013bd93ca6e6f104177b846f06f0fc8/kafakajajorev.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/nufenixuzumejejod.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mk39bqf77fnjh6dembsb9027mg/40698574388.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a670255cab4---zoziralovataremelevom.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608217c55bfaf---50289582264.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/tosimub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+prevents+sustainable+development+from+happeningPDF 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_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 11244 bytes
SHA-256: 3af0b76546711839ab9662bb0eec762180fb5aa093047b32540ef8addb18deda
font_01_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 17524 bytes
SHA-256: 9fca2ba223b5ab1098cb6ae85cbc4670f4afa686c1ff2a4119bf3578ac215313
font_02_sfnt_off00017477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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