Malicious PDF — malware analysis report

Static analysis result for SHA-256 518d63ccc65541ff…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 18:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccb89052c48d3bb8ebea7cb19233bb0d SHA-1: 0a465acf3e415138017479b04c3419626051dcfe SHA-256: 518d63ccc65541ff4aec94ce3dcb3ac8da4ee8cf48bd144777cbdb7be0cffe0d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://france-ex.com/images/blog//file/sutewa.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/nixikarorazonadilo.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/7863090110.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/58146502843.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a8481c51f6e---73066851986.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/mufaku.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a559fb133d7---63876175148.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/49816231114.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/bemoxunakatotoja.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/37452711503.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0aaab570---15450826237.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c379665340c7154b2d6c034a1c605003/23367664495.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a3b61810---jonava.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/21216455556103cfd9cf86e.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/runomurilifegituvifi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16127579926a31---22106346122.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fusudig.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/20056447088.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/19762086843.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/35278062715.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/buruwikumamo.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/raduru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=data+structures+and+algorithms+pdf+2018PDF 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 18464 bytes
SHA-256: 4f1d91b9b87de88ea3b70e8eef58927f90727325d36c10c33542c34687fa1e32
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 11672 bytes
SHA-256: 6a2f64c3df035d98b54194e1af734b68f717ae70d539839047b9f70bd5add676
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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