Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b6dafa8166b783…

MALICIOUS

PDF

153.1 KB Created: 2021-06-25 20:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2caa6ea4343096a2f3893e833a5c4a9d SHA-1: 3ef8572171815665ae550df9ace72bae35604ae6 SHA-256: b4b6dafa8166b78356022a2fc608e52321f7fc9f6253f906d7ba6cbab56a657b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9339

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 https://archism.ru/uplcv?utm_term=geometry+chapter+5+resource+book+lesson+5.3+practice+a+answers PDF link annotation
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cb5812974---vagebanupavenigawaxap.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d00c79ede---wizikazovofitapamoleruko.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609058144b68f---jusigeritomeliresezid.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703051aafe0---31349841338.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/16417807758.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707db380ca1---bovibozerupul.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/39312672945.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9c55e32df4a69631c96604065812575f/5471954808.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/79da9bedf95c7cdc3acafc72424c12ad/72517030859.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/11651762836.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/77964077075.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160912e57d8738---limijefu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/muwizunotifegufomamut.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/66139295539.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a610c4caa---89704163059.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/74f12edb308ec37e557240ea684165cc/63168403004.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/33657194258.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/73489420319.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210610054650_kj5agl.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/882e83a24hs1vbijitmmnchl32/fetupunasaz.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9002c68e---liluruxufom.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b21b580b---jitesefuzin.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/24757389387.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/tixelesimibade.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0182e873---kusozaz.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/watof.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079281bd669a---nigufatemef.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2DD 11584 bytes
SHA-256: b58853cfd30a21208578dad96265e638ea4610785337f4644b43b7d4e4227d2d
font_02_sfnt_off00020e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E16 18596 bytes
SHA-256: a89ab99d43bdb19f7afaf7ea2dff316bfb65ae1121425e1789c94f6253d23948
font_03_sfnt_off00023ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FF4 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29

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