Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa0e8a999104bda…

MALICIOUS

PDF

101.5 KB Created: 2021-09-05 19:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ad772a0b48160f9bb7afba4f0b0d285 SHA-1: facc2053f07962ff7203195f46874ab1538e1f25 SHA-256: ffa0e8a999104bdad6f8bbddc67838322f83cb7addecbbf32cc1f18ed7807065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests the primary purpose is to redirect users to malicious sites, likely for phishing or to serve further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/29721713790.pdf In PDF document text
    • https://preprodpcb.com/userfiles/files/79658170720.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab634eca5---78703025791.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zoruwulipabuso.pdfIn PDF document text
    • https://unaizahic.com/Files/files/vivib.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/beromu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/25134426746.pdfIn PDF document text
    • http://szhlfz.net/upload/97459929335.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c4ff359d1---bivarozise.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/05b87836ce84f8a798ca06fa911f8505/5583174847.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/womegubip.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/vitulirajo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087860960cde---nekitarasom.pdfIn PDF document text
    • http://landpas.pl/upload/file/vakugawikazizup.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/kovonufufimaxikativozek.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cd580e03533---33614124562.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/49214a84e082369edc135cd08eecb85a/88343113797.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/77195146281.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gevejanefepizusoluzi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/81899834323.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/kabomurabifopijerumudo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2e20e7d42ca67711d42c144455cfbfcc/laduv.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///70245364742.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/zaravifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=critical+thinking+pdf+university+of+ghanaPDF 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_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 11304 bytes
SHA-256: 6017e0a838eadef69fe7f829c5c3d3726c93dd823541e46f9707bd23c6817472
font_02_sfnt_off00015459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15459 18996 bytes
SHA-256: b746449a8aec36fca3e1b5acc5a6f77fa4a8c67c3f4fc07f7a55959376367a86

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