Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd9ec5d1d62dff4…

MALICIOUS

PDF

79.8 KB Created: 2021-08-10 20:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd2f49663527365c02c413f90bb43fdf SHA-1: 9216f7a36e86f4e6c6d6b02db5288761cd85ae03 SHA-256: 8bd9ec5d1d62dff4bd8cc6356960dc4835b3b375bf2d1c754017295a88127439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm hosted on a compromised WordPress site. The presence of numerous external URIs, many pointing to potentially compromised or disposable hosting, suggests an attempt to distribute malicious links. Although no scripts were extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfd92dc3c---26966559090.pdf In PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vezulanogufukikizaluf.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kinafipuropokodukemodupe.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/luvowulumifabi.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/76338951681.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/eovho2oaku14t9n57caku19rln/20301209240.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16282511059037.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/gepoxe.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/tadawupuveto.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5e72a0b0---lezalotazafetajuperodevuv.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2mtam0kbomfe9f269g2b827kc3/mejaku.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/26633fe0c12bdaf38a89bdecba056a8d/fisilovabov.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210622_152410.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5c85d6ae---86543887775.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/fisabigeduridukebim.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tifufujedimafemovep.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/gepajediluxa.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/mafibiwininikuru.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/taibnp2eh1cn2al5gjtgaujao3/2320267792.pdfIn PDF document text
    • https://coatielectronica.com/files/girikuvazofawisig.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/firaludijilam.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/45227185695.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129216ff11---samomudisovu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8c7625f10e84ca85b0facbaed97178a/nunimonexavikiwejalef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=la+gloria+por+el+infierno+leer+onlinePDF 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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 10224 bytes
SHA-256: dc55f9254cef6e3e323298c1bec654e484c72260cc01afc631f848615af1e4a2
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 17852 bytes
SHA-256: af57669e4833a11501ed44ca0ffda01c8ade8be9b147ff153b5a7d8f91e2c375