Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1a9eb2604787c7…

MALICIOUS

PDF

843.7 KB Created: 2021-07-03 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71221d3cd46e435d66d7e46ff474d1dc SHA-1: 55b014f46cebab33c1efba01f5d8c696d96cb809 SHA-256: 2f1a9eb2604787c762bc007e8f7066e178830765c6d24f822f96db860c4033e0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, and heuristics indicate it contains a link farm pointing to compromised WordPress upload storage. The PDF also uses an SEO redirector, suggesting a phishing lure to trick users into downloading further malicious content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4660

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/15d0c1318ef3a60ad6fd235c94e352e8/totitaro.pdf In PDF document text
    • http://apogeeconsultancy.com/upload/files/77520297975.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/71260321762.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/99605109992.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab48a0185---xexuvuno.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/30799212847.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f96329c0---bojomomoxedusetavej.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6edbcafaf---dobexolemolowofeke.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072473be5e8e---86614240447.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a407470e35---dowowasebazoxovomed.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1f02ucdlarhnb84045aad2el28/domatasibolafene.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tajamelobulisoxa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b9d9f278---nemilajejikiji.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/68823444909.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/53265825171.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8df6d14784d963e512784d520a04da74/1501008217.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213ce9d652---nosupojokaxilit.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/47525714603.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kuweboti.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84a76a506b---dijadurejofovunanijonepon.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3620907a43---28885872172.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d113587d5---bufoma.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202106192571_636508771.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wumuveviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=leadership+without+easy+answers+reviewPDF 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_off000cbb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB79 18172 bytes
SHA-256: 18ada4f4ad3fbecacb4fe63837fadc2fd28eba43b22c283950ebc6289ba20fb0
font_01_sfnt_off000cebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBCD 10768 bytes
SHA-256: aa3207a92a5175d1c17b48ea949a30422aa3c8e7fca9911aa7407eabc9e2222b
font_02_sfnt_off000d04a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1