Malicious PDF — malware analysis report

Static analysis result for SHA-256 75266d83e8a18263…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 17:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1efca687b8a67753fd0cd720c3adb7dd SHA-1: 759e7b46b15407f899fe2e15ef8b8cf36bcfefa1 SHA-256: 75266d83e8a1826322430decd62d30deb2f2872b76e3fbad62e1df4d0c0719cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The presence of multiple external links, some hosted on compromised CMS uploads, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alyansdugunsalonu.com/userfiles/files/70371574080.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/doworakawu.pdfIn PDF document text
    • http://martonelektro.hu/files/file/xeboxipob.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/topovupimivaniguzorezixo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e15bcbcd375---97977338432.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f72229538---92449044270.pdfIn PDF document text
    • https://cargobull.cz/res/file/23006882249.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9eb7b145---piguvazuxazosukila.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/sebekulasegilapex.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/sifosubuwipejirorode.pdfIn PDF document text
    • http://clerus.hu/files/file/92441286938.pdfIn PDF document text
    • https://bunianco.com/other_files/File/20564386239.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/53254658220.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/57521470388.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/bovedotitadejojomosifoz.pdfIn PDF document text
    • http://rsst77.ru/upload/files/kutitobovowunavaxogorez.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/664cd39937c944ee2e5fc45eb420eab2/41792087140.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/32559829656.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/48005954391.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71019806518.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/doporolarowelemimiraker.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aef6ee1abca---sutoxu.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wovawij.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/xuganejowenivupufos.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/9623435085.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/78364306037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=digital+citizenship+definition+pdfPDF 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_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 18604 bytes
SHA-256: 716078fa28959ee6f7fa8d2cc8e0baa9b2340aef39877830dbbc02f55294fda6
font_01_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 10860 bytes
SHA-256: 7f2bda95acfe81d579e10c3fa7643715a165571bffdc089a0ec9a7a3d4074ebd
font_02_sfnt_off00015ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1