Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af1b8f42797c8a1…

MALICIOUS

PDF

220.8 KB Created: 2021-09-08 09:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cda196bc1dca910d74ba2c1b341f8808 SHA-1: bf1b0f6244b31aa0dd80f1bd6ce779e7c9add1f5 SHA-256: 5af1b8f42797c8a161fb8c3cd4bb1aefca3ca6b20396a4abbed8d19dac8e54db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or a second-stage payload. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=fundamentals+of+hydraulic+engineering+systems+4th+edition+pdf PDF link annotation
    • https://burgaseguros.com/userfiles/file/vugike.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/resoxononosoxoluzelolub.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720446b0e70---mesonufalafusetuvax.pdfIn PDF document text
    • http://qca.ch/userfiles/file/xalebadoma.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae725f0daeb---4359695389.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/92399814339.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5316be2e5d---4283527746.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/da5cb9e759e9e276ce51306857e818cf/3603026324.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/58896846948.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f02525d5d50---towurarajopazufimitogezi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rf5ht8c9ls2nui09l6jbvh8vbh/60997132574.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/67570552.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/30328356624.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/ridinaf.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/favunuxedigefe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5b922d4d3---xopawulepekas.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/71130886688.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/fijemomuv.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0227631cab966ae0bad1e4b32a66a123/89708742884.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/9467268619.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a32483b0---ledusoni.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_off0002f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9BD 11336 bytes
SHA-256: 1242df3c524b48f636cad0634438a0e7f15e2d4f04e23e23a5ffe6c1c0badc89
font_01_sfnt_off00031410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00032c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C22 21464 bytes
SHA-256: 76168b7bae2e5ab6c0e20bc1da1973235283b4479dbc4e27a6d4fa1d8a2a958c