Malicious PDF — malware analysis report

Static analysis result for SHA-256 84483649b8462fdf…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 14:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c93217c2d651c81aa4c684cc150e387 SHA-1: 43ef1436e25a0fe2a3951ee25cc37f1a0f51e906 SHA-256: 84483649b8462fdf84caaddad574a4d397430fbb3d4a46f8c67e80645bc17ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=lcm+worksheets+grade+8 PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-5-27/20210527231119968986.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/177af78a5cf3f439aaccc8b76801e464/zewenifibut.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/50514905983.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/totivafefevorabibesugo.pdfIn PDF document text
    • https://webmenuplus.com/images/file/ribideladagibitifagexekov.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f42575bd1---79375840565.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/18bef5f1fad61f7ebcbfe2e04c692190/nazabapujelagivo.pdfIn PDF document text
    • http://dges.in/userfiles/file/bovulatuguzabo.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/nuponaxomudazob.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/mekexu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e95934ac---sogabatibasedi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/9863796348.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd74a483fd---lujimisufeke.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/86695006404.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b757f96765---juwagokanatoruved.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160998e050bef2---17852318048.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d537abe54a5---jutidiwudujukez.pdfIn PDF document text
    • http://askort.pl/Upload/file/42140342051.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084a984591e4---puburaket.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/87f6a1b0fae3b7f448259e13b88ff577/31454620599.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2e953b3e---kojijul.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2phfk3mgfjf4cdsu0s21nnrn8d/dusotakibomagamawodige.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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16772 bytes
SHA-256: 4e24e32f8875b60baa749fdd885bd1c0de4e51e50b21d265aaeec78c0a33ba88
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 10916 bytes
SHA-256: 9f2cac696762f1e6009c7a16fcb1fcc6d805ec59a6fde3aaa37ea8a305a95cd6
font_02_sfnt_off00013bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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