Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea0e5231fd77881…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 16:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4730420418336bf05f5f1d48f7379ee4 SHA-1: 0ce82eb59f421ea0f93c131d83a598792df5702f SHA-256: dea0e5231fd7788162451ec0ca8c49d2b0936fe2a79a4cce452b76d6443671f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded artifacts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=all+creatures+care+cottage PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084170d5813e---92350303796.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/mifalevoseri.pdfIn PDF document text
    • http://packturf.fr/files/98553867101.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea21bc575---38630870448.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16105ba3e6cf9e---sosaloxosagika.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cff2d4ddb---71127370299.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7185d0281---puraw.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca16e85a6a---pizonagosi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7484e3cd55---74837931989.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/63598320730.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/midawiguwa.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4f86be23542e5fa4349df6d06477db6a/23351102876.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a287c9a102b---lifoxojukemil.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4ed5fbaa---60717057046.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pirarejiwovuzulalogod.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160cac82f87878---wabugojapuzuximiw.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/potaziderojuza.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/15550944930.pdfIn PDF document text
    • http://uchid.com/uploads/file/90792602545.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ddf565206eec1a697a78371f0d1f8951/33185358267.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/17988113142.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acac410d7f8---80861732882.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/tovuzudekemagerifavole.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/60290713604.pdfIn PDF document text
    • 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_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 17592 bytes
SHA-256: f4ed6a81cd5913ca36c3f756601ceca7f0bc802f468c90d5b8e79f1c6505e283
font_01_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10288 bytes
SHA-256: f3a6553674c228cc41737814c2250ff6464dd2ee837be8b4d9c015abccb01c8d
font_02_sfnt_off00012ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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