Malicious PDF — malware analysis report

Static analysis result for SHA-256 0527613f8bd69b94…

MALICIOUS

PDF

85.7 KB Created: 2021-07-23 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bc3f609c741889e25cff1dcf70fbdca SHA-1: 852a848aa1bb9510723d027dd8f06d02150bbe27 SHA-256: 0527613f8bd69b94c8b815549507373cf40bf202af15e7937d9d15904a2d3448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with multiple URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of these links suggests a phishing or malware delivery attempt, potentially using the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6k4gqkh0eehs8deetp08rfd16q/13220274494.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca51108f79---sezigubudakozokinalanuper.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7794855c41f25cf9e2413c4013c03cef/tuxepiwo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609019e668b59---sudurojulejerig.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/36664042605.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac4e238f82---pujamatitovipariderizor.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/38419968118.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/91cbb6367910d688b964f0bc383ee827/5560868550.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebakewa.pdfIn PDF document text
    • https://wagaskar.com/media/20599011083.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/vazuxoganigis.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zafavuxuvapegisefabixu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870c6482261---xowave.pdfIn PDF document text
    • http://azizolace.cz/images/file/11805087485.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/23289241104.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965ae196538---85825818725.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/13211213174.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/nir70777pnr0lbj8fgld7soq5949mno1/miwujamapusotajebimudef.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f99590fd5---74547264324.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb384efbb4---58510013576.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97e937d9d---fifotupafoxokofumijipuwe.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/37790714995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fox+terrier+and+chihuahua+mixPDF 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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 17188 bytes
SHA-256: ff12942508eab8680d3b1cef759b65bb61c2e22261a9c5bfd789834abb2f4454
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 10600 bytes
SHA-256: 2f95fa33c5123dbb281f41a190939ab028d77d46960009bdee9adccb689fbe26
font_02_sfnt_off0001314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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