Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e84104619034372…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 10:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6bf9da0cec6c7e87df4d25ce451167a SHA-1: bae25af2e62183261f36541497efc9fd0984f71d SHA-256: 6e84104619034372ba136504491824c25810fd718032f9eef608b922cc4cdc4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further exploitation, while the link farm aims to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://siliconautomation.com/userfiles/file/41012570973.pdf In PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wamubizofexemugavef.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/61013821487.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/bagenerudor.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/175876fdbc3cc8b5498757071596a087/wepisivatifikemu.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/70896672158.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/bofuvezodarixelisibomipor.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/67929128024.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/semobofexino.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///vuxabizatekizob.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d766c1949931d4b1174d1ea92799e124/61199503348.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5262f9e1819837c7f10285610f85a1c1/zinogaburunuruwalobani.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/1390451039.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/93014510226.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/87985899868.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zupudeb.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/86937562810.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/madixagugajaxi.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/kunupamuli.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/jegogix.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/29021933657.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/62310739399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+boruto+episode+182+onlinePDF 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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 17464 bytes
SHA-256: 45e3adbb029cdd2057e56be8a9bd5b044ba9407516862498afd39f0a54066148
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 11224 bytes
SHA-256: e8a04e079782d5ea07ee0203584e7aa47e025328cfc80f804eb2f053c1819299
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1