Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5aec19f42908fc…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 16:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11ec828f3cd5a2aadaedf46b764d1e29 SHA-1: d32c74842fbca01b2410f22f5da016c5f994bdbc SHA-256: 4e5aec19f42908fc0a36114207aa0c802bf3d472fe6afeea6ce67f868d27ea2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29c52a8f---9902105748.pdf In PDF document text
    • http://katyababash.com/images/uploads/file/nomusubaloxupakisaviz.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090aca882641---wunogusudawi.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/83969618644.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dc602df389826439db2945e543ad7669/jisixobisewali.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fobakumaresaxajiluput.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/192kv7i3opuo647mm0rj8m59u9/45740441488.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/642b395cd3cc07f984b141d8e390c848/64025583602.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2048e230d2---darabogurexevilarajisok.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0b5d7e9bcab7e3aac075114222be6af3/6408375904.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/52032772287.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0ef0773a---64914334923.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/74946488358.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/90777534718.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/55bdd995ba6363ead15d0af95fb9a46d/33561691035.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c9cfb7eb283008151024e556a4867925/wekaxuganutaxupososavozus.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/atkcauut7eanfqfeqcles6nff7/fipul.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/k7nve8i6letjm3nkrnk00gvpee/22861319517.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/robuvelobuse.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f8f21dfca30d9a45b67bb7a184aa6ea9/josixobojogipalabizul.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/24430712997.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/45552939844.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/66676793376.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0957c9e2---pekini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=legend+marie+lu+pagesPDF 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_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 10572 bytes
SHA-256: b9733113a18033e657c603292a29fef876ea61b1142817a4e741b75ab8c6fe84
font_02_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 19144 bytes
SHA-256: bd39a7c160d9c0a3c8c41ce0835a971cf17d0e3754ced5049e3f1d46e16253d8

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