Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f2041ee5c4cd63…

MALICIOUS

PDF

110.0 KB Created: 2021-07-15 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 48e06619d7067df896c3580b79ea4d45 SHA-1: 1af4f1b0dd28d8bb41014213d9eac9fe0e48483e SHA-256: 54f2041ee5c4cd63f7825ce6c4ce95638e3e03bfd0b406ac712ae5c1d05a7ae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=how+to+paint+a+pear PDF link annotation
    • http://laclonghotel.vn/upload/files/gusususawegakonitap.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a9467fd1---pukesuwunuxeg.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb7c176e---97026232995.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed74311256---xugukavaseguzofevugux.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/up6vckgf7sr9tgub8hj5ioecam/92115835604.pdfIn PDF document text
    • https://stopserv.ru/files/file/keraseninepa.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/q1hfje5vphbltcar8ll6crheg3/pesopefivagenaf.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/gujozujikikefilotem.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/wisizadukegujanuw.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080e37a9eaf3---vilopetenose.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/fefe6807c761765e0d27651f4fde387d/puguwutedugage.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160772eb0b42f8---95152758385.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/fifevujesesifafurepozip.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jsfg5qosiajj8atpbmrs5qdo37/46225084088.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/mijamufaliludu.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/54233281281.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9994e46c073d7474dc417fb60473e6d9/67465281649.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/394dd82c1403f7bdfd5f553f466b419c/zegimupir.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85793021f2---73628662665.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/linekimuja.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c5531353396---70792591872.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_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 10108 bytes
SHA-256: 2bbdc6cb165111ad80252d71e9e098e8f405f9da6210837cab4ea38d978580cc
font_01_sfnt_off000163be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD0 18504 bytes
SHA-256: 620e28a056537003b2ededeb64cbf34b420b35afc218db3d661dce991c4bea04

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