Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feeda3c62f357c2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 10:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50d0ae0f064791ea178c5f5d763789ac SHA-1: 2d59237725b0cf0517872e65a4986b3e78588961 SHA-256: 5feeda3c62f357c29112f5c7e2aa8b9d48d4fb5864defb893342b8486449b593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many of which point to compromised or disposable domains, suggesting a link farm or SEO poisoning tactic. Some links are hosted on what appear to be compromised WordPress upload directories.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://timnhanhonline.net/upload/files/78363540516.pdf In PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/74755162040.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/47674973053.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/18a982f99b22bed042e5ca3efe80665f/68947235665.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/13775322678.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/47231130987.pdfIn PDF document text
    • http://dezis.ru/uploads/files/23258080936.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lr2mbvnm9fqjnnfqiinouo1qgm/gawituvofaragelas.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8caf78590---xenet.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/bopaxo.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/42372256897.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/molimolewonib.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nuzodagakafutave.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/rugarewiwajuduzakukis.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/59879991749.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dukito.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072da9ab435e---68118166482.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rifinav.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477ccac01d---degog.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/28337529255.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/birazixopatizipe.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/7390781323.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/4041193816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=medicare+program+integrity+manual+100-08+chapter+3+section+3.3.2.4PDF 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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 12020 bytes
SHA-256: 783a58780aff13d09a2335a0cfc30c2bebe9a1246980224a8496b805af793408
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 17540 bytes
SHA-256: 34401638e3d7faceaa6bf6189380602e10420b383800d00252d5d883b0ae15a2

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