Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d9c04acb3519c0…

MALICIOUS

PDF

98.3 KB Created: 2021-07-17 01:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 783b8ff4eca7a016c949f7d6efbd607c SHA-1: 4f2e1da46b30f8eb02fccfb9323b157cccd2ae18 SHA-256: 68d9c04acb3519c0042bfdda9fd811149cd0bfd0ffd148c6e7cd6cc97dbf14ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bdb76d32b7988a666b520c164637997f/95866582522.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/64c1976765624d0ce1c335726e2db0fd/33861501536.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e7f60929---7960459035.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c000c8eb019a6f85af767bcf77c65e85/93787603405.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bmj0rb8dpkeu0si03hu8u34ri1/lopogoponivuliloxozujasof.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/98551578526.pdfIn PDF document text
    • https://carlojans.com/cms/file/kegonidiz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8960ac678---24445277767.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160847d07cb224---sumefog.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094dcdda5c50---29212226990.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bd193104---64303948414.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc5aef9cb---48772778502.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/55931139677.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e953d1eb1de---pogiwudepevoralututodu.pdfIn PDF document text
    • http://christopherdallo.com/file/nanodufobitafumedosozovil.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160744af5759e4---fefelovit.pdfIn PDF document text
    • https://luminex.pl/upload/file/70725319539.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/41629767117.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0bn72t1m1qmn4abte2e6qvhmg3/kadewarirenaxa.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/002f72cc280b6021eafe9c18de212434/ludunodojololibetedexurel.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ee7811b274f787b9a17e3019de4ded25/74749283173.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b815985f93---18353587716.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/96793060172.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/fekujanabepebibibijine.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/af07e105c77d3166b9143ea8545bced8/73932736634.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/bunov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=unrequited+love+lasts+foreverPDF 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_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10664 bytes
SHA-256: f510bd90ea425d8ce0a80c4853286d01669e2b3424cc78526ec89c5f29b36fdc
font_01_sfnt_off00013752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 16992 bytes
SHA-256: 697b3c15439d3222308a6f1f88c2edcb5f0a3e53a14e77c8fb9397de087979ef
font_02_sfnt_off0001638e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1