Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e5c47b6c46ac87…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 21:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 479d87fba3e5ad98450e42d239691655 SHA-1: b95dbd33fa85dcd302696bc539757aa9cc4a9ea4 SHA-256: 63e5c47b6c46ac87d15124dec36d28f1ae5eb16f9a58c21f06524de960b29c0d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external sites, some of which are hosted on compromised WordPress installations. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary intent is to solicit sensitive recovery information from the user. The embedded JavaScript likely facilitates the phishing attempt by directing the user to malicious sites or further exploiting the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://mtkshop.com/images/uploads/file/55462721496.pdf In PDF document text
    • http://noithatphathuy.com/Images_upload/files/95954869576.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/tekexavebun.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/3135808522.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/xinedesenunos.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l3qnjhp7fn9oe9v5lg2nh1cch6/11494216874.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/63737286706.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4948417bc822f46fab425e3b647bf79e/6536668115.pdfIn PDF document text
    • https://kar360.com/resimler/files/19222549452.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/66585846724.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746179542f---vebuwuxarowonulugubil.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14533681986131f3b54e2ef.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/zozurura.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/43861513805.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/motoborovafidipomawu.pdfIn PDF document text
    • https://festacontinua.it/public/file/30756030983.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/kugubolagijipopaxigepefek.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/suwerejuluparuvuzo.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/xibofavakoraw.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/fexakanibikiperasito.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a2d99a87802fb0d974466100d0ae7508/38949545412.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/fufazewevorexabinigosa.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/39316214080.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fifotajopizemodat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+star+editor+downloadPDF 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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10296 bytes
SHA-256: e662bffd0cb55424522acef723a67e784ce709341ae425efda8551865eb14f38
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 18640 bytes
SHA-256: bb283c42b1805cfb80701d22cfdebdbd13e5cc17d27ee52aa14fb83af11fde6a

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