Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3720626cb6ce15…

MALICIOUS

PDF

92.7 KB Created: 2021-07-18 00:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3961382c47138b5011ec1727cbe37cc SHA-1: 89f2f4b75fc30adbff48189e4320b90f51d3b3a4 SHA-256: cb3720626cb6ce1561bb364103565d6d2cbc3bfef2f451be51cbf6c86c2d6328
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9353b283fa4e44ddd95ed8d2beb552f1/23696138259.pdf In PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/30643780990.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3dff93b44---kovatoxozilekulaga.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/72h9ddlfc9b3frp1vja3c4grl1/99790521770.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda918cc95---fotuzevakokeve.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/xezexopojuminavuni.pdfIn PDF document text
    • http://ned.ru/uploads/files/kefofujomizomatidavasu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lsudasphjlhtlv0rgq346q0hb4/jiwozawiwibirugera.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/jibuli.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a7229be940df79efa5d9835fad817f46/32073759725.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052505455959.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/fifakat.pdfIn PDF document text
    • http://eviinstall.com/userfiles/files/68966085133.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/00c7a31475a89cded3131b9653f6996e/814531964.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ddc5584b---ratotimibefowazamatuxama.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/82c20417d28288734f5812f0c8d1d47c/71493461057.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4802af4e---rojejusorimemuwovixutuvo.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/10157552549.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/bevovosedosibexo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/58628746372.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689becd7e7---sibowutaxenavadagofeme.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b8abb4e3---42025038351.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/86508623789.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/89862580771.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/rukanukoxusazewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fall+back+timePDF 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_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16904 bytes
SHA-256: 720cbffaf4f0f25075e4b1d7c6addd408d6f4dc7253dfe81f4aef6d30da1d016
font_01_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 10108 bytes
SHA-256: dd1e834d756e03d236c66ab6108250497504d2169b849ba95dec94cbf661845b
font_02_sfnt_off00014bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1