Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd88a53b2abf1219…

MALICIOUS

PDF

82.9 KB Created: 2021-07-22 10:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf30051aef94bbd466d0a3499cdb5f3d SHA-1: 9e2059f0538de522de7ec4974e08763680331485 SHA-256: bd88a53b2abf1219962e298976b67af2c7f8f71f60e61488916246a301218796
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xelagivawuruf.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0buolo8f4ju49c1d7ohispmck0/nopozitegosavik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f4b11768---nufuxutasoroxusaje.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/94255339721.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2557432754---sinuforibuwisidebujinizod.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/59f96168403494ccb889286bb2f27eda/dixavirenenesajapikof.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b0edde9e64fe282de01c8c01d65c7e3/26089134849.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/94262990612.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/18641080495.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607130251cacc---fanegejakavoxi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5ebh4onrj59o3kb04t6n9cjqm0/50697232023.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d7b0869ce5fc6aa09c9aa045f667048e/60268365127.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/dubodadoludutegufon.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/67774397335.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/29567936478.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/wetuxawupeluze.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/zaxulipu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/35118312334.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f066cb364ea4260e2e081a661a1b8ffc/36051557018.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a9374dd---26526089878.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/25263137040.pdfIn PDF document text
    • https://actor-conseil.com/files/file/73286181077.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/64919aceb9713f131da2a9782832f5a3/35063282894.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926bc15a4ff---4216749170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=clearwater+cove+lake+watereePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec4d48408b---91102276291.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 17096 bytes
SHA-256: 582cf3c3b55b57508e30383494cb99c913b72188e7e8e6d59dcab9add40c492a
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 10132 bytes
SHA-256: ceeda3dc931943d69bb69ad382ae5109ed5f1aeb21b671059bc0a2a0fb9d4aa3
font_02_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1