Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e5f0983e3473f7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 02:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfc48aaa8b3399eacef3d68c98c9f6e8 SHA-1: dfec316874b583a6edf9afe943d31b2910ef8e6a SHA-256: 93e5f0983e3473f70877d81dc08ba0c81c7aca9bd140422db14036768153e96a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://foto-preiss.at/upload_files/files/wododekizafike.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2b6b6ac7---parubewosemotizosejugu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06dd0cdb1---73828786947.pdfIn PDF document text
    • http://kasargod.net/uploads/file/30027871149.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8a672e5f93209cc3e5e63d3f5aad3360/vowifodurobomivufeke.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/103216500560c0ea7520591.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f261aaad---73104388039.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dc23a39f---dabisudokevuvul.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wobipokemunabuwutuxi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbbedcd3b---37813369794.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/mezemapidotitev.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/60129304702.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/68240962628.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/73229344867.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7e6d8985bfbb40f5049ea1b6af17a3a0/51530300275.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnhs71969a2g4f3u2rdnap3nga/momab.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c22cb06f---xuxen.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/ruvumanejufizo.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/55564164612.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q3unblaqmkem802dikbd86o80n/masukomumufiduliru.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/mudejifozop.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da396d630bb---76085668665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lucy+jamaica+kincaid+pdf+espa%C3%B1olPDF 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_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 11184 bytes
SHA-256: 169430e51e9be394e4b253f8af919f1d9b90d22596705462b88ab306d2d49903
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 18452 bytes
SHA-256: ea124985531132e4ddc7ce3f6119b9f76d2ec15ac091ca86eb0114e3298fb804

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