Malicious PDF — malware analysis report

Static analysis result for SHA-256 40086d7c6cf715f2…

MALICIOUS

PDF

68.5 KB Created: 2021-09-08 08:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d66cb8bd5172c1e25071ba32ce4927e7 SHA-1: e306ca7387d97feb0831b951cdd1ea74e32ae1b0 SHA-256: 40086d7c6cf715f2ba069d2b336a53921efe547c0e2a44796178179a6ccc52f3
176 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a phishing lure, specifically an image-only document with a click-outward action. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://imi.vc/upload/files/36855223258.pdf In PDF document text
    • http://hodoan.net/userfiles/file/57750643655.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd999f26088---resigas.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2761f4a1b8---dusefafelazob.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ilmhialle17gi1ctjmb5gvfojo/rakisasasovakitegode.pdfIn PDF document text
    • https://go2germany.ru/files/file/newarirebotopesoximumoxup.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/pekujuxurezatagigogen.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612503253d65c---lotewugasoremepa.pdfIn PDF document text
    • http://fygl.net/uploads/file/010634032678.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/momagul.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/69925320507.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/74356854631.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/xetikupewuwuwologade.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/76281980944.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/juvobenosoziz.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/98388705219.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/bevox.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/h6va3m3humgkj638a5utdhn9hv/rigudakome.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7978f37c2a---suteluwerajo.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/2896486020.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35342a89d---77204918334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=positive+impact+of+colonialism+in+africa+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_off0000b096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB096 10848 bytes
SHA-256: 815b3f7f7ebcc07de3982a80028616919d2d13dfb5727cdb88ef17e4a3592be3
font_01_sfnt_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 14052 bytes
SHA-256: ab6fdb4cb69c49b7cff2f0f1823b614834bf0bb76dbd24c0ea5c124441917ea9

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