Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9a85713d3b5b7d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 01:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4790f896491654d975e85e42de356f1 SHA-1: 9e9d9bbe96401820f17c37b167becce3f27d07b0 SHA-256: 8b9a85713d3b5b7d3fc1f6d7de93fc18d179af9587f22a9a01556ba2e602bdec
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other unknown hosts. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e5ac268c6---sajopobuzit.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987968ac674---31511025646.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/67810997524.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/wumaloliva.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3c5ed4f0---nawaxiwen.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac03e8c5c1---vejadudesumulanekojopo.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/12476718882.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/wopenafi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/60749768202.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c711b0e7cf4---varix.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab19c7b432c---gazima.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/bopuzida.pdfIn PDF document text
    • http://ping-property.com/user_img/files/56551714273.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v0jrmjchs6v713hh5ocobhnc10/76803693904.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64f892e1f---73196497508.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/solasogasolozes.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdcac6506---pixaki.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jrslmvhcb8likdjdsas34m65b8/18131386186.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028eb875738---46677391266.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jupelasevedisir.pdfIn PDF document text
    • https://equimat-cheval.fr/file/35583392095.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210724_C1D72225F257E446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=interpretacion+de+los+ratios+financieros+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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 19624 bytes
SHA-256: acb9ad75b07945f799f27693347c8b3b5b950c953f19500c3fa54381bb3286cc
font_01_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 10564 bytes
SHA-256: 809b41b2250526c92ea5c5f3957ccd64eca1269d7a142701b268d12643e9c2ea

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