Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d17141ff9b1e1c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 00:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4b6132a1d0c2d1f44d8ea3f6cf0a5002 SHA-1: b89228ef8bb42fa7360745c81bb8c03a14d45839 SHA-256: c9d17141ff9b1e1cf3d5f796cc057110bb32c57d4a0e324b231b507b7dd53a96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=hide+app+in+phone PDF link annotation
    • http://wonderful-foods.net/userfiles/file/xipozodelobixo.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/45834091477.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/nijiditonozidifodu.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/25921270726.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/59460284412.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/25319120494.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/wofixewumazebuvejaruboxuw.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/60866391303.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9938b0c5e---27070145293.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/93226671154.pdfIn PDF document text
    • http://strandedtattoo.info/file/30908182908.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3b6170204---80820986789.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xenisuwigujakudajinev.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/6672905390.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/wofutopadiwopig.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/fovapoxasejudojosumawozi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/539fec8ad7539c2f0b3fb98285239c67/nalitifijagori.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/posovufuroloromefotokil.pdfIn PDF document text
    • http://jarosi.hu/files/file/debufejog.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86181859958.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f846dcb27375b6563ba8bec205839803/57696295065.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146f2ceef354---52436563885.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/putejiwesakeso.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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 10068 bytes
SHA-256: 1d3f2865cb0f3329c4c7512975c2bb1e36817c4462fc46465b1dda33c347b080
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 18432 bytes
SHA-256: 061732dc45b14182967a4b48b9ebe9f9ac1273a3172ccc7e98d4f656109dbc3e

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