Malicious PDF — malware analysis report

Static analysis result for SHA-256 02588bfbc3d144a3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 05:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 14fc85636dc4e3e590adaa1b61ad2049 SHA-1: 40cfba59cf2cb3685d20b9696b259e60656ebbb4 SHA-256: 02588bfbc3d144a3615e68ac02a3306f8073282c73ec090b7996d1cb5ec9209a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/t9duc094foogvsd3bt89a1qq0a/somipel.pdf In PDF document text
    • http://xn--e42bt3l.net/upfile/files/fapujevej.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/66403280828.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/49626685286.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/67727768216.pdfIn PDF document text
    • https://blogsma.com/files/gekowalasabuvodojezoz.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85398155567.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fe71a4e4c---puxofumagurizi.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/senadazumi.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/nuvobasupimenixunanazami.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/65b9ac38d2978bd0363fdb941fb86bcd/38056402433.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/nojixakedevazoxu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/31340110400.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/21045253748.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612381d545ed9---67758287253.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/16859817094.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/68840369887.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f7bf2d0dd---62559998655.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/djir2nkq8l4722rjlbh8f51fm6/wuposoximi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a78e29de53d971f2f4560194e877e5d9/15975536591.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/1610926035.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8377b26744---30424275066.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/zovivanatogupu.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/jovuwadaforakonujuxi.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/wabadepaxiju.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/84261183934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=product+properties+of+exponents+worksheetPDF 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10888 bytes
SHA-256: 7748ec8fe1cc20cb2bdd5dbee71bf3f750023bccfc90e72c2d32ad42fad8d003
font_02_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 17768 bytes
SHA-256: b906b616f3822feb7c1307e682641b7375f7a211cf6c86d661dd7b18092e131c