Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e41e1b0a7cc1d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 18:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8b167ca3081b527cdd25a11153b91c5 SHA-1: eaec089501d46820291f5b2dbd6ebec3886ea38c SHA-256: e50e41e1b0a7cc1dcac9d7da4022edd3852a2df65c664ae4963ccd2998800744
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a 'utm_term=download' parameter in one URL suggests a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tydafa.com/dafa/uploadfiles/20210904032052.pdf In PDF document text
    • http://www.tamtrebinhminh.com/public/files/larapamerisezaniz.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/97014388199.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/42751779058.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/3128609552.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/nipanejadujebinumek.pdfIn PDF document text
    • http://erex.hu/upload/file/84891405983.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/98273383299.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/62255353135.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/63752948269.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/jaxeguwo.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/dotavefamali.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xelosudijidoporafet.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vumomoxixafubut.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/xifozodavasuwimitiv.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386e976560e---rawekuwuzulopegu.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/39787677477.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f78a802ecbb4ae2acef62d4a89eab279/6269110392.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea473cb7ed---97080713256.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/narasuzapudekawedafo.pdfIn PDF document text
    • http://tzsunup.com/upload/doruwotopolezokofigolaf.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/pinetunejudewumipanajutaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+inshot+pro+ios+freePDF 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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 17448 bytes
SHA-256: 28e9066ed3435cbe234b245a0626dfff0c9473d95c1474cf729103ca99db8dea
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 10680 bytes
SHA-256: c295643fd96f462fb898b313d45d47bbf36908b124b48fd089c0f6b0ff428bd3