Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6145d837d4a5464…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 04:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb21a3ef2e5ea453b0a21245deac2a46 SHA-1: 2d75ec7b1f10adb155ba79600fd7c8546144ce6e SHA-256: b6145d837d4a5464abd00d249211db69edd3059a904b6ae09c8df72c85144155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://medosojewellery.com/userfiles/files/komub.pdf In PDF document text
    • http://a-xian-coat.com/uploads/files/202109140047058922.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049b9aee40---43656403153.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/76eaec0b278948f5a9507140631c1ccf/73441737070.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/29f132c2091a7af29f02848467f7201a/livepanodebilabilanupidog.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/paxipodonerugi.pdfIn PDF document text
    • http://zzweien.com/d/files/9145812609.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/53912950001.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/73313094031.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614698b58bbc2---bewututagal.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614062a1cbbb8---89450501717.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/32788509275.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/93132718610.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/puketikuregininivaxesa.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/92090909785.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/83341778442.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/vafixutevivejufutax.pdfIn PDF document text
    • https://steammining.com/userfiles/file/madigazunitolanuj.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/addd31da7315e3ee6572b5d315fe4bbf/xivogexofor.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/dopudukudasobesububeruv.pdfIn PDF document text
    • http://kes.org/upload/editor/files/wekosulitakav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=unity+nfc+readerPDF 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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10256 bytes
SHA-256: b129961fe3a8abc1402972724a1f802dc30b7c3fad11c07a4d9c2c54b8d9aa3a
font_02_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17208 bytes
SHA-256: 8e4935736a1540bf7ed0d63e548d92ea0d05c0b0aa3952dfaa37142c47ed2f99