Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e0250fb40d587d…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 06:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 779d1b5cdf06daa6b3bc53ac55eacd24 SHA-1: c96d74ec0b4a5bab2c663ee214bc64eaa4fa10ab SHA-256: 43e0250fb40d587de4a2cee8509e09296e471a962003b73d24f6fac9ff2e6b37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=new+twilight+coming+out PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe3f9c1---96063232016.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/q73uosiqv1358732arukj4g1bu/kedijifebimenufigozi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/25475586867.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/95307541156.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109171127279691.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1ff7e61d840aae8b422c5ced2f25c608/14538806858.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/31084063438.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/139c0da4734c3603b460e283bda55913/83135986604.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/penelazowaselewekeboke.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/gokakazo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e991f702c6---lafewor.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lowukubuwezolita.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20211001_094611.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908233401783364.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/pufojidosujogebole.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/ralijigeb.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/guperojenadovapodidago.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/42700327529.pdfIn PDF document text
    • http://ewtch.com/upload/files/9227184883.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/31698694477.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b519a08efa2d91b366c6eebaa49e0825/41802442709.pdfIn PDF document text
    • https://12shio3.com/contents/files/40061426161.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/miwor.pdfIn PDF document text
    • http://saint-party.com/media/file/78764772177.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 19352 bytes
SHA-256: 3b848f3b2b9e4b8b0a04f304a108f8c7a282966725dfbb312072b40f6a599944
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 10408 bytes
SHA-256: 3c5d83f6f2f68fd03459d7c6431a05034731317b511d9f78ec57b6948177a247

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