Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da70c931d9fa4f9…

MALICIOUS

PDF

73.4 KB Created: 2021-06-26 07:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ee7b6b7da2dd5c7c78e1f66bbc31e5b7 SHA-1: 0c21457573f57d798a7c1e3f3fd94f0c85880188 SHA-256: 5da70c931d9fa4f98bf5188a34989fb776b1954c1fdf7161bf70d0911e4033c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of these links suggests the document's purpose is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4580e8ec89d04f1ace8239670131f1f2/fakesu.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9bf7a20571a201e499781a84975a92d9/nowuvixozufujuxara.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/87907491772.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/36435004038.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c85d5b56dde541ffac6d928a37693856/43019348512.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1403fc8961e0bec5ef550e1d2b39b534/30609354719.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d360c823920---80351304805.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/38156340091.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/30665196028.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tekixegufuxonipe.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/54189936411.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/jafatuwojevabum.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/14260590535.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sogowoj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f5eb336c---sujewalo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f2747cf5---jivapesekipupukogiruf.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/juwopujowiwupimatu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/46639540564.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/pugipitivolukavumawebuku.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/008bd375463961c3f266cdbd1f92b737/46731576788.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/6577943892.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/56918972667.pdfIn PDF document text
    • https://mfdesign.hu/files/file/96937887880.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624385530675729941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vector+analysis+problems+with+solutions+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_off0000bb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 11296 bytes
SHA-256: 55a0a088995745d8aeaea3c44c8772b1a45145168a30f538a29279c2cf8ac63e
font_01_sfnt_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 16364 bytes
SHA-256: 1f0c6b53dfe403c572e5620bab80870e358a078ddb7f8663fafdf8b5f902631e
font_02_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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