Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb778a33b6cabf7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 16:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb695f3d95b1277a05774b1ee29e183e SHA-1: b54dc6bfdf2643c0b64a8e139c7d897019677ff1 SHA-256: 1fb778a33b6cabf76e9f25884d2ae12f609f001a6edbc4233ca232f7e2a3c0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=push+notification+tester+apk PDF link annotation
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/dulefijivavuwunok.pdfIn PDF document text
    • https://domilot.com/uploader/files/26987062860.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/penijerulixabip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148402d75878---46170855548.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c2314ee00a8c0112c1e99f5e8cc07d4f/towezoge.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144bcc4366e8---satokirugovo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d62f238ef---24469796822.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/27824086294.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/52499099945.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8ed1878368a477f2dd6c1fb82e2826a2/ralinezogolifaf.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/selovifabele.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9o0ioco3s479rghc91i5a69t52/41792730251.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/vabituxaz.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/29439118345.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36b04254f892a8d97f719da754d59269/47329691188.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/8545923384.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/90900964187.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613693953613c---87372438537.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fubipawutuleduwixoveb.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47333676565.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/7568971763.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/rumubuvinew.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/nenevidezili.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9becbc147---bajafuwujitaxupofesu.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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 17244 bytes
SHA-256: ad2c08de13ec300382756baae4c6850c3a2f48676f5305f37f71a1a272f76652
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 10724 bytes
SHA-256: bd3f57539721ec841010cec83ed16f0102825ff9ec7013715340e86b362e15a8
font_02_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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