Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b05944a4869fd1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 12:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c3d6a2a13ef44a2beff65b70f4e163c SHA-1: 387ad72afe40e4901c4328724792eefa0db857f8 SHA-256: b7b05944a4869fd18c70ad5dabd80264e5b33a5c6aace94d6c334a66e3c39cb1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=sawstop+table+saw+owners+manual PDF link annotation
    • https://alzubidi.com/userfiles/files/29556561110.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a585346c---bagujixametusasumabatal.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139be97811---44518339960.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/lapunudepijozufufaxilejuf.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/nalenijowawirokigogexonut.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/32380616442.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/nofugevedimore.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/tirikidatopon.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/xakegijogedogiva.pdfIn PDF document text
    • https://cli-kh.com/uploads//files/202108121446543199.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/93140c1df5f398777d3eacfad4ddd5ea/58392137150.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/84220964420.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fb0038b7---tanosisaliso.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000c8196a1---83209230768.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/3112708316.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/86387539674.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/21535769278.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160deec2d2ebf8---21704554979.pdfIn PDF document text
    • https://basisangka.com/contents//files/fogebiwoja.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/aechs2t7hp89mr4p8jv3fcg8d1/fodatuvudud.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/tomujebanupoxopikesubufaz.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/55417624647.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/vulufupiwogaridujigijelo.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/83748991246.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 10724 bytes
SHA-256: 44536e9d9c65ac8686037ddd985a8464ae8a5167bdd372a92bb6999b437bb54d
font_01_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 18784 bytes
SHA-256: 4a413dea987ac32d2413dceb2036d75912902094671a5dde4acaa6a56ecb766b

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