Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba63074f32a4ecc4…

MALICIOUS

PDF

76.4 KB Created: 2021-08-20 10:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 246300cfa371f6fb6e7d05eeeade4782 SHA-1: 709935aadc2676ba049101e52e60ddf3bd90e845 SHA-256: ba63074f32a4ecc4be4be026781f2b2ace38b79eaee17c264467ab65e8be1028
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious scripts and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81a71bf1e---95950310194.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160918298479b6---popizukalajarefavusonuk.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/rurutu.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7b52718399d2e14659eff52cbebc41c2/kizitozutiluvipumes.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/63o1pgp2cf8qtrhmfhl84r4935/96526515524.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/16155971083.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fec6e6665---30874724145.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wujaxagazadolim.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/19249339492.pdfIn PDF document text
    • https://baglab.pl/galeria/file/17675115305.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0c97d0ddc2c306c568eb99139f537733/zugitupegunef.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d8a6d6e8ffc4e874dd31f818f4d38cc2/87656017181.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c411e76201e---zofepo.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/43771224729.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/42969076111.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dtdgs64spiais16bq2pu5m2s3g/degowite.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gevarakewuvuz.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/xivewonedox.pdfIn PDF document text
    • https://magerp.org/upload/files/98143039106.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/baxofedixule.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/jakisubamivojejebawegob.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/jovugovegejoweji.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/nililelalidekekadeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=solutions+upper+intermediate+student%27s+book+key+pdfPDF 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_off0000c3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 11212 bytes
SHA-256: 34a7f4d8bac1fe8e079bec25b229b4bc7acbc8b22e31eb7d7be68b11c05dfd94
font_02_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16532 bytes
SHA-256: a246570af9274bc0bbf2847de6fffea49e1f861499e767c5bb859e5fb5abed17

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