Malicious PDF — malware analysis report

Static analysis result for SHA-256 c719c918df8c5cae…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 05:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f4b07725b8e55bc522f3002f3793869 SHA-1: 960fba94cbebbef8b545f535f76a84ed2c62720d SHA-256: c719c918df8c5cae6d0fab8bd56663f0a9a32d6ef581fcf7c3c785a1e21a7329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818ef0a301---16555731120.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a11c1f982---86831411793.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/xijofexazepuwube.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/190038052873.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/af63a910fe6ce9faf17bab2c26145b14/19639460299.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sunupara.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/10e22a16efb539ccfdd05867a6b55f55/xukozelex.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-17/images/files/24586698080.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/26691007230.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/49360541923.pdfIn PDF document text
    • http://beiks.info/public/file/dolov.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/29627339463.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dbcc60efc27b38f924c9b66a23fa390c/6585552517.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/bojipameb.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b8e4fcb834296f0a6693ec5a9a76c097/likeno.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/zilufipuzum.pdfIn PDF document text
    • https://keongracun.org/contents//files/jamuwetadonu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d8312eaa42d648d4f4c82488b4eb37b7/goxuwipimawida.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/kemesivokeji.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e8ebcd880587e5b649bacf3e1fab8530/45953613944.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/xifivofulareleratire.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7b4b580---ranagoxexibela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=blood+filled+cyst+behind+earPDF 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_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10880 bytes
SHA-256: 75ae271cb751b9dc3ef8403e119eb031d0cad9153c1809d9000e7b22ce9acd21
font_01_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 16172 bytes
SHA-256: caff8f96ab0b719123074593b6fd32e3b529a95f4c7a4c4c4ede0f0fbf4e9fb6

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