Malicious PDF — malware analysis report

Static analysis result for SHA-256 631ef0d654ee4da7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 06:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d4f83b849adc21a07f17b0adfcf1fa2 SHA-1: 33def6a211dec59e8b45fb823bbb3b7ec2743a2d SHA-256: 631ef0d654ee4da72ef81a3d071133470dd340f4c26b2f18beedabc69272379d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs are hosted on various domains, many of which appear to be compromised WordPress sites, suggesting a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fafda55462b74b3c7dbda5be813310f/48636599441.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/motopiweluluwukaxoximur.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/robudumi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/16634955205.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d471cb7dbae---mawewaxexok.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g3kccv5qp95fk2k1n3up6jeib6/32288439905.pdfIn PDF document text
    • http://abwrva.com/uploads/files/resefawojujivaz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vidlfq855e6u6bh2thioen0v31/zirimedamamosataret.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginowubizidanowovabifiz.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/pupetulivulexonegowi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa68d5b835---83819913785.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/vikonuwupakub.pdfIn PDF document text
    • https://noventa.cz/media/files/file/11224224691.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/07a2400c1a0ae66f6bd66ec30125b0f8/62465055763.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/vorurewosezuxalug.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6313ef06fe---kivomovusuxubowubem.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e8b9df76---22645915509.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/sanevagezekopalab.pdfIn PDF document text
    • http://greenbrier101.com/userimages/34417308626.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071906590494.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b9cca7a5---siwomitazixuzebilutot.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb38be7c4---81289929567.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/pirikubon.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/96505309212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vision+mains+2018+test+series+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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 11084 bytes
SHA-256: 06d148af03edd94cad6b06fcda201ce05edb375d3a3cc1cac77b97fea7e51e3b
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 18068 bytes
SHA-256: 179c38662043032693bc87df10e8859fcb87abe26e1b2a2de8c0e80ae39161f9

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