Malicious PDF — malware analysis report

Static analysis result for SHA-256 9558429b72585677…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 03:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a76abf4960e891c4773b1ca884093873 SHA-1: 0677b62840da4a38abad0930bdb1dab68eb5508e SHA-256: 9558429b7258567770dba3ecb555ac82487f73e853ee8426cb852cd1fa661df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious files. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://fcgo.tw/uploadpic/files/begixogixusonisikuji.pdf In PDF document text
    • http://ballmillfactory.com/d/files/68244705850.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/7941926414.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/65255584072.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/tetixapipe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c26fa2c29---88255721122.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ed61f7d3472ca83076e5e4c60bf2c20/33441449570.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd72c66c4---ludine.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/76232915803.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/55659623894.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/wikusiwuvewemiba.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091011100634.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/330253709613ca897f0384.pdfIn PDF document text
    • http://crm333.com/documentos/file/89098065603.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/68277838817.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/tojezeniveno.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4b118af82da781a43e1979a478469704/kabezarojiwumelojevola.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/77537434774.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210915173008.pdfIn PDF document text
    • http://techbis.pl/files/file/bevukewomujal.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/wowawomerutilusugiwu.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/80837120524.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136870cd48bd---81154138324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=test+dpc+app+free+downloadPDF 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_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 10572 bytes
SHA-256: c015c1d8224e4fdae194a0ec54415b81aa0ac71cc2b48e0f6de64361bb15c576
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 22604 bytes
SHA-256: 54969b870d525a1ddbc341abe4e1251b1fd18b70cf6e7ccfb8304dd9cb15da93
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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