Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7b6f8b6f1bbc95…

MALICIOUS

PDF

88.9 KB Created: 2021-07-27 16:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23c8fe722e209b7c153eaa65b816bccd SHA-1: 948a09ddcb8b280e5b741fb7fb263da64347f350 SHA-256: df7b6f8b6f1bbc956f8bbff0934e61ae79b7049be340276ab5582c9dad56710a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160996388794df---3893591585.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a9754870210f0433e6299244ddd7171/10267196067.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/om52bjab6eaq1couhn3p2br8af/65584676656.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/pevoluvizefonabudop.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607410b08af96---gobanugimavumeziduj.pdfIn PDF document text
    • https://harom.ro/files/file/39122047322.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ce0d3d89bc0fc74294a3e687b2400824/majavedovuzudamozip.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/webelurit.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/mimebij.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/601043921.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/gulalodozumokapig.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609201bbbeded---kixubapogemewepeboxomi.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/pijujudedewawalaneji.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nojebanosukaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d475f74733---63515216481.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc03a6aac7---pemokotifipexux.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/51464792033.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/91737185372.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/mexiregogumenikuluzef.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/57rhhpjldmr7thp4nvipbhpu7v/26369231826.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g1l880ri3higp9sogv72577cn6/bikaropefupalupeg.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/33161966948.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5llmvu5h2t0av3lavk3nemcui7/88472908731.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7b01cce1d3a8bc37c0e09bb4bee312d5/61105388379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thematic+statement+about+fearPDF 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_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16948 bytes
SHA-256: 24fc7e7eadc65eac5b11e24a9be7f86241e3b1fd726ef6664742a5f2d5093279
font_01_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 10756 bytes
SHA-256: 9b4d661f92a1dabc0837d3f4c15ddd754ee043125cd5e1e2b9e145b2c863dd49
font_02_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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