Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c30521be254b1b…

MALICIOUS

PDF

90.2 KB Created: 2021-08-12 01:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fef341b894036767c873ee0a100ac1d SHA-1: b34f20fc1b235bb9fc615dde098fe7265846fba5 SHA-256: 35c30521be254b1b57d13087936d5c627b301053e4e0fe4bd6c3d8e74b137890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=planeaci%C3%B3n+de+instalaciones+tompkins+pdf+gratis PDF link annotation
    • http://bukharaatlanta.com/sites/default/files/file/samuzexiwut.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202108120608079976.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1e47f0adf242690e7f9edb73c494343e/75138737658.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vagexof.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/mavuxemobekonadugive.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/8062131291.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0db49ea135395bac32dfa1984ed9d505/84812608633.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a592a202---92053870157.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be180ac232---81837049286.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/43860109197.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/mexodulefobar.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vinapokigamesimeni.pdfIn PDF document text
    • http://nensi.si/upload/file/90734332059.pdfIn PDF document text
    • http://mylodge-naoshima.com/kunijaso.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/90876572610.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d67361d470e---90211773489.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/32017675109.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8f9d8cb503bf5179d482ba301bec951a/85378554386.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/7540506903.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mifaxavasuseruxakaf.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/lefabuxusebitefavasajoxip.pdfIn PDF document text
    • https://euro-commerce.bg/files/22899379805.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/33726904485.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 17628 bytes
SHA-256: a9e1adfac030071b0ea181b556a5cae4f52d2411b0e47e03cb4708554b264524
font_02_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBB 11196 bytes
SHA-256: 5ba2c5fbda581c9d15f549033efc41a8edce9ff0ca94f74e541ccaa6d7b155d5

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