Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da4eee9409434ec…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 07:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06732c5dc4690ced26d0efa9fb00f26e SHA-1: 2abe3f92c01d896f21ed651f3f7560544d4f3a75 SHA-256: 1da4eee9409434ecbd614f7c200d6c91dc4099af7f383ad8aabfb8f9f9e53767
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malware through seemingly legitimate file hosting. No scripts were extracted, but the extensive use of external URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=bodybuilder%27s+kitchen+pdf PDF link annotation
    • https://ksuskalology.com/images/file/11093383503.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/81741438588.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/gasuwolex.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/filufuvova.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/dunizaxesogolew.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad6274c941---99812907702.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/bovusuxekarolonoselobevo.pdfIn PDF document text
    • http://humanlitech.com/files/files/35981402143.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160775e987a397---8507868918.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/benezezuritetefukalefa.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/mibo8sfj93e79fg6jj73a4i4vk/76270644312.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9b8d2f485054bdd091ae01190e0895fd/lavekomilewigizef.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/fatifilevujenivizetuw.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/jitotifetugaporipobexo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/87685310644.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e44593e0---85891165726.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108081229112057.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e0c70e47---mosevimi.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/welisirawovokemep.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/rakur.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e4vhs24prmt061cb1bjaaeok7g/64584045158.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/47273897830.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_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 11088 bytes
SHA-256: 957f7989be92f9ed4859ef3aef8ca50914b0ef00e54ea8e9c1d7378ddd14f008
font_01_sfnt_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 17120 bytes
SHA-256: 1e3afaa399c79ffe63cc192a080e55affc6c98c85aa73c7d85321843ac659c12

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