Malicious PDF — malware analysis report

Static analysis result for SHA-256 375b49b25b7f33b2…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 15:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd6e7e37f172669288d1e7673e4f397e SHA-1: ca00c28e1fd65e12cc4834e05f5d383e7b9aa16b SHA-256: 375b49b25b7f33b2b2bacf8421e15c1e6b81e8e0b3c3d0cdeb5d4d35352cbce3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics points to a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/51792060202.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b046790ce20---zevugurun.pdfIn PDF document text
    • http://intergeored.com/upload/File/8644800664.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/416037ff7293a4bc88050b89f74a5486/68227514727.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/c5kthsigdt6t18id8krcjejfb7/navitejesufumusisobumi.pdfIn PDF document text
    • http://foodchemsino.com/d/files/81603073866.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdcb42961---jafodagaxuxadupuper.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ef0153d5a---lemozuvadavo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d958ae44731---tanaxosunuwis.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2780c52f6---47352156389.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99170cda65---79238487735.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e8aff7d9466879a67767fe4673a2885/93734781560.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/61048881631.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/nazonuxiredarakipeli.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/dakixuv.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/latafefopimunafulos.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210605_005958.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092296995d79---33467004449.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/89294478400.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/vasol.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a917d25fa0c9cfde7fba86cc2b4a7de8/nebebigafutimadan.pdfIn PDF document text
    • http://daydala.com/userfiles/file/43530296073.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6fda6bf57373868bc8f6f4f20379144a/gopefigimereniv.pdfIn PDF document text
    • http://thuvienso.vanlanIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=surgical+anatomy+of+the+head+and+neck+janfaza+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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 22972 bytes
SHA-256: fd9665093ab5374db59358974c18baa83bf6e3d48b6fe5b6ca78031aa0ff6f33
font_01_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 11468 bytes
SHA-256: c5409cc3a1bba71f7645ac36fd01dbd8e32d35d7b306e3ea3b9f2fb11f47097d
font_02_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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