Malicious PDF — malware analysis report

Static analysis result for SHA-256 694ef5b70841c6b4…

MALICIOUS

PDF

99.4 KB Created: 2021-06-26 07:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b1130b557e292d693faab4b362cdc547 SHA-1: c9fcb167a3329042bff6bc47d9dd70b8fb7284ad SHA-256: 694ef5b70841c6b4320b5ddc0aa48fa4ffb5a3983f2b475dfdb90d7b1fc6cb8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad33ac5b---zajobedeguxisibabimulixop.pdf In PDF document text
    • https://techson-cctv.com/upload/file/77667914320.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8a81d9e8b98a2de5bb438accc1778a4f.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0e515c42---35580013961.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5a2c6256---fifimepipukazabibudepate.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d392c2bf95---56710412812.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65e3b56031---fuvipawog.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/292186079.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/gnl1ijs9j6hcf5mfid8nb15o88/lazazozufinerikupu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5n0807hn578urgrru9ald7aa5/35916310705.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/aaf2618fe6ff5bba89568da046849611/7222308142.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2b97e1c0---zunugorel.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077194ee5921---kuwovigomulo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tiwopez.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bukusajikewager.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7792beb---43982900535.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/wemodebedorebe.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/81556025766.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6b96a6efb4b9ff6806b500d4e104b260/49052213418.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/02091159732.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/24604247530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=trenchmaster+150+for+salePDF link annotation
    • https://mediaget.com/userfiles/files/25778002170.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_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 10780 bytes
SHA-256: 7590fe4ba510e8ab1e02e51dee00c4dbf76ca613a392b6efc0fc0a59a5793a50
font_01_sfnt_off00013b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15367 17424 bytes
SHA-256: 87079f609b054142233b62860bd83e5a05456e5faf5714224a38a0b3e199b6c2

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