Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9da42aff245a8b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 15:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f81b85a73c5a43d3e843d36426b8a75 SHA-1: 720f85ef2b92aa99e09b0fb187db59ff10775049 SHA-256: 9b9da42aff245a8bf467faa55fe9ac3e52bf97ef141e6915a472815f87385c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used to host and distribute links to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/097dbf55f0315a5e1c55226639dcb42c/89335263151.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/8845930926.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/duluxudefosabofalonor.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/53364087432.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/fezutivasitelajapaxanegi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/30968270063.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/11366954093.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/xerovalaxuvuwagilebuz.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/wevulexeleguxeset.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/dojabig.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84446e043---bugovaregima.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096214732010---nafukekenitodomurepe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6e1e613f2---56951749902.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf3677b93---senipi.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/rejemi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6e9d60456---92405381196.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/69421107318.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/debigekawanajitoga.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/739fc81485a2b2ed7f6b5f4a72051a71/miluvobesejej.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b89b35555---xomawipesixigomelun.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/lazatoj.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cdadf506460f4884b5beadb9cea383e2/21434381151.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m43s3bfrm8pm4b9h88cd3979d4/33421405998.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b477f652bb6---37667149709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hcna+routing+and+switching+dumps+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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 18264 bytes
SHA-256: 840c11728a54bab7a30b45c41c7c118dd60fe211402a63a1fa6e1106555333eb
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 11064 bytes
SHA-256: 3b45acb7ad80c82298bbf3df64aa09510a42a9ffd481e12b9df1bc447f1c9f8b

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