Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63423d7b9248484…

MALICIOUS

PDF

91.7 KB Created: 2021-07-14 05:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1b93ad47c985be67c49108b84a93351 SHA-1: 496317e8be7073f860cf76381a48ff5841dbf6b0 SHA-256: d63423d7b9248484e0dabc183ea1e4cd4dc8bf03c7b5a47dd2e89c235f1f2f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and link farms is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=revenge+of+nature+meaning PDF link annotation
    • https://jamuiboe.com/webroot/upload_media/kezumovusomiv.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/38730257486.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/cc593673a672b4f4f1c12374b429faaf/14939942036.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c243f960b0---vomafugomitoletuzalanaf.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/76343272136.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/74026823346.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vinapokigamesimeni.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ilhekgrg27os3t5mqiraan4lsk/68266765451.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/denilonarizoforedug.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e233e0cf9---vexejuvepixitigateli.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/natufopanovado.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fo6bg16p9joa5p07ih2khru5v3/donegadomogapu.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/misonovemalelalow.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace27b3e628---96524658073.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a243cb040e3---mekegu.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/43281519459.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xepivure.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/79193267267.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/lobepezu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2255e60d8---61766272841.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/mazewitaj.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/73456248562.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_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 17948 bytes
SHA-256: d80ee21d713ed03973774e545f0fc7649e5aa2b6cb5608b80384240e92bd9795
font_02_sfnt_off000147f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F7 10552 bytes
SHA-256: c799442dcf0d52cf08d802517266dee69a482dfb4a68e5da96156929ee203f21

Open this report in the interactive analyzer, or submit your own file for analysis.