Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c49db167a442b2c…

MALICIOUS

PDF

129.1 KB Created: 2021-06-19 14:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5815831c849d40215bc2d2e36a5cb20c SHA-1: 7bede4e42b0ebb2489d9eed61267297ed762cb19 SHA-256: 8c49db167a442b2c48e53eb7647b2f36a4f606b38676abe27ed6ce856b55cf71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.999871 strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to downloading an album, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://imssp.by/data/images/fxeditor/file/tebiga.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7rh9a44jnkf38raj338rlg1bi4/4786029144.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/25361032219.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ra609nnhreevramkrd414ob05p/19640001322.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2150bf50---muves.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/disivekedelubasakumefo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909e3338b20---49037285830.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf032dd28---sinikudosesodomikazopop.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7c030ecff9943d578c23fa35dec7bd49/62781857172.pdfIn PDF document text
    • https://airshow-bg.com/file/17902479587.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609434c64ac27---29483257715.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/957cb71008f8f47fd3c42e2907a37249/tatoruvimekugelaraxekugid.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/bolomopuxaxipopaba.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/judilujipagiv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e275c07506---92959358673.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/62547656318.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nogogisopajozigij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dr+dre+the+chronic+full+album+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA56 5316 bytes
SHA-256: 9a55b55ece3b20235bf59e5172c14fb7496fe43287ccac61c632a8fd40b52f56
font_01_sfnt_off0001cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC53 11992 bytes
SHA-256: 3bd7d78897629e30d7d2d38cc10821415b0aa54fc85b6b8a845acf0bf3130594