Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ffec7d91282382…

MALICIOUS

PDF

99.6 KB Created: 2021-07-02 11:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5c3b09568f9bb408a1a75d836d2c4d77 SHA-1: aff39810db3b36071549b7c5684bb1ded221cacd SHA-256: b1ffec7d912823822ca5631600cd162653ea6c614335e9f1cc912c3ea883cb68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49dbde06a---lopezaxogada.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ramibujoxulojonuneteral.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/gupijazap.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b89a7ca7---3259691128.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/51a8b028c1de6c23a5f53c34d75e8beb/roledebofaxerexu.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/41925237965.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15185341228.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a796f2c30c---rezuvesusugizapemoluda.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dee623d8a---18063401124.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea0f5631c---gefawijoma.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089069eca3d2---91495557195.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e1bbedf91bebc05402f0e170f111b79f/27681226995.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609524fdc8af8---sobewimopodinezugokezovi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae1f2dc54---sokusimenokasavakusoxuriz.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/1154015894.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7qlgtuam4m1q5gujdeka7hepgh/ladotekaxutasubujajuji.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a9f37709---vuvufose.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/88436537675.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a9314432cd2a18bc01b6c9d80dfdf992/67231609010.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/21ce1d6bd92c433f40af75f5c541dfff/80165140574.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4060fb45c7b68708d6603848109dceb0/35015738410.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/vuwoduvo.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/15822491699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=middle+ages+female+namesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 17244 bytes
SHA-256: 79d41a46161d84291ea4826f4d61903e277c11cf1d2498c99611fa7cd4e9b421
font_02_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 16500 bytes
SHA-256: 485f4fc2eab089deb5dd871745d220129881520412a6fe5b713207ce80a36948
font_03_sfnt_off000169c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C5 10372 bytes
SHA-256: 055ced13b2e84548352578f87d08c1a80e80c6b97b157af1b29f7d49f5b53ba8

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