Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d21fc4cd1b96bf…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 07:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 62e5e5468c526d3b8b6832a630ebef8c SHA-1: 277f8891dca5a6c4132448fa0fce9342a81f63bd SHA-256: f2d21fc4cd1b96bfb8b2a40bb6f3d30d576cd97ca93003f5650f1a64265c6cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/k3r6ugt9fv6vmn6l2p7js34sou/belubinomo.pdf In PDF document text
    • http://susutour.com/userfile/file/29499600996.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/dobusiga.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/22649082867.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/tokatakovipapatu.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/sigav.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/kajew.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/sopifobefomozodowewam.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a2c84642b---sowefademutibereni.pdfIn PDF document text
    • https://2acontractor.it/images/file/bifanudanib.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108200426529845.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4a27c4fc6117545ae3f76531352b4270/siliwogixareturexido.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/56092194032.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2c349cf88e4fde0c235342c428c905f4/wuvanenudiposolilipi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nalob.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ab06df6cb8861d696546ef5a2c6e4930/kafipoxusem.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b56ec433---12701671699.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bda7bf224---xipukaxirezogot.pdfIn PDF document text
    • http://fxmeat.com/upload/file/fc49b415448b990579f6295fc4ae04e8.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/xafigisosaxivu.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/wexawikajosojirudajoj.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7ff69a32---gasezitatefufezafoxaros.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/vf270rp3scgdj6et0k2rh3rrv0/28460853949.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/dibewoku.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/kapokobuvanajesimedame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+pdf+creator+with+crackPDF 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_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 10728 bytes
SHA-256: f12bfd95330c4778a43ab1897ecf113ec2a734e275140b699d378cf01ef3ec26
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16900 bytes
SHA-256: 3808db75a9f77ccb7b3ab951f281aa4c9756a168b07bdbb8c79220b3d1e4bcd8
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1