Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d26fdd2172ecab8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 00:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcc2bd0082de4b3d1ebb5b296f3b4458 SHA-1: 5cf16a2e5d88c5bf9475eb15f1a945f116568672 SHA-256: 1d26fdd2172ecab88133b29e4afc40dc34a148fc6ac91c4932a8ca632f822178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. This pattern is commonly used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=fresh+breeze+solo+210+manual PDF link annotation
    • https://bursakaynak.com/userfiles/file/8830175226.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/bifewudugon.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/42725106383.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tonojupux.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/firinapabimepumifizeluj.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/tetagazoxalovupegaku.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/82409006860cbcb14a6ca1.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/561a57771c6d2ce5d16426dedf72a5ab/bakuxerovarerupadixexusep.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/84598563333.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/jokomemekuz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607537524f6a1---56542703803.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fdbe207c737c34584f4291f023d4b5bc/68500273625.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210508143043144.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6e24a2d6---78464056971.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210521033234157231017.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/sewarilejijimiw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sceb7dcvj193osh7kegomljluc/kovuzevexipixusi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e54209b8f2d---29549844979.pdfIn PDF document text
    • http://wamer.org/userfiles/file/fusagavep.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/92445031865.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/97598089811.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/42882803624.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/puwal.pdfIn PDF document text
    • 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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 20012 bytes
SHA-256: 2ddd39e56dece7b0387cf360cb12839f8e869fa60a140ae4daef9a1ccd8d3dc5
font_01_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 10756 bytes
SHA-256: 7dd2408d797220c47fa7ae5ce03f33a3dea275f5a50e361a0668e170e800f436
font_02_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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