Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a65dd017bde106…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 13:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99a42595ce34d894caa777e049aa1d9d SHA-1: 4a2bf752ca73002597e15a5a448c6fc38423c490 SHA-256: b4a65dd017bde1062be459bfb3bb4ebe2ce68cf6dd66ae5c6318c3e8e36f8841
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous links pointing to external resources. Several high-severity heuristics indicate that these links are part of a link farm designed to host further malicious content, with some hosted on compromised WordPress sites and disposable domains. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=topologie+en+etoile+avantages+et+inconv%C3%A9nients+pdf PDF link annotation
    • http://netinflux.net/userfiles/file/kupawiraguvuve.pdfIn PDF document text
    • http://happy-land.hu/editor_up/33407573283.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/futofoxuvikonumivar.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/begisinopesilejuzoj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/91378978321.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/72621770035.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c5265f5f---79783022523.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/fosugojeja.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/19800257320.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c835d82b4b---57774984280.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/zororapowosibo.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/28386151726.pdfIn PDF document text
    • https://ms01bet.com/contents/files/wetavolusulimutix.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d6ff41d392ef623b2f9d0ee60b9e551/loxorubetupomidetut.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/nuzurexixepikub.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/karosepejanilikoza.pdfIn PDF document text
    • http://kammed.com/userfiles/file/xisojajutowojiwuwovok.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/o4fm4sh7i4fnvjj2l0mp8macfo/86262709220.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/27bc46bbb351368b59ee2056c62e93ec/bijelikimo.pdfIn PDF document text
    • https://ranagro.com/files/50725252909.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/kebipaku.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/lolugetovaman.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_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 10880 bytes
SHA-256: 6bebdd7f1746bf569266b72a5d6fa877f87dc0ff4ece27e3ca1bb820202b5bff
font_02_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 19088 bytes
SHA-256: d236a157201f681c77fa70a990dfe49ac3baf0d3637cd7ef53bb7d99f3bec948

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