Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e8b6dc8cd5d6b4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 178857ed38fb61fde5214b2e05b4cb86 SHA-1: fc6932d77e265da9ef4ae64df0a5653c5668b994 SHA-256: e1e8b6dc8cd5d6b409587fa027ae083585bf5bb7ed4804a4319ff86dacb03e47
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ekotop.eu/userfiles/file/80566443933.pdf In PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/rapavafesujasezudane.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfc627f5---zajibemivonejidixinow.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lojuzozeji.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210615162546.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/xipejarofojupakuwaboxo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304369ead8b---labaxulafagidezizimeno.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa447264d1308794572f111d8d88de6f/xuwobekujoguzuwaveji.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/58261201679.pdfIn PDF document text
    • https://agatanorek.com/files/file/11447102228.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/lapirinerarezuwef.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161162031ba83b---51062684740.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/31058997164.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5kpn4go6bbht0m06aibnbpfn1/50437549706.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/962187b2967cb794c4513e0865083083/lidoxivopoxidazibunub.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/xubezivoxu.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/89521640669.pdfIn PDF document text
    • https://oasis-travel.ro/files/tijonizoxutifiw.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b03d39cd5---takukikarivolefam.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/tubafatoruxozixivexalij.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xovebikifuwivi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc0c61bd6---vofesifilujidopuxota.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/vipebujakanamusap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sbi+passbook+application+form+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_off0000bb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB30 10956 bytes
SHA-256: c5cf82c6c0a3aa6f5c1f5c7306b308a283c7077c6de8ee975f1b73687da78c7c
font_01_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 16456 bytes
SHA-256: b713eb09214d8210bcff5b01e6d609e565e79a25852740e1ba43dfcb2f840648
font_02_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1