Malicious PDF — malware analysis report

Static analysis result for SHA-256 757ef3e56adb600a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 16:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bd489b71c7e425b92ffa41a8016ce65 SHA-1: 996d5f0e414de3f2b69d9ea583a64f3627655fde SHA-256: 757ef3e56adb600a6ec0c6eabc2828948af1225c372d531296631cabc54a628f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document's structure as a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=shareit+karo+download PDF link annotation
    • http://dietetyka-24.pl/images/files/88764358280.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7db222f2a---seguwoli.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/51662818521.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/41398370048.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0077265850ccd7c79cef6c439a6af783/70148710279.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161431414a5676---69369308920.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/41495162494.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/1684997155.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/61078833237.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/60645236025.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/54592156073.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/wosenir.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/17227927937.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupewin.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sb5d82s963tbni41d4umhcm3ef/noxediwupibitowigenenod.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cf9411ccc53089fbe2a41e3d169a9f27/dolukele.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bc64bddb18a3dcfc222ff3ff5a482d4/36021547409.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/72226128190.pdfIn PDF document text
    • https://edusfera.pl/upload/file/gojum.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/folow.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/37287485988.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/4795712892.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/49404710514.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/92547291949.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/gogevatupozixilisutoza.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c075bda1d---nakusakubojapujilub.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_off0000bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 19064 bytes
SHA-256: ab7606129152bad434ca0d8f4f0e31a564171c9e09c4ea28c55d7f2f95dc1471
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10428 bytes
SHA-256: ae8c35be2efc289c6b7892506e1b4fc75e99f5b63732519216e5d0209582ed6a

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