Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49ec80e7fd46ced…

MALICIOUS

PDF

97.3 KB Created: 2021-07-05 23:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ecc0a7c7cfb50720fc7f537809036828 SHA-1: 86c8d4de007b042d087fffb86b5a08993b2b9b54 SHA-256: a49ec80e7fd46ced67848e6fcabdc68f44f985f84797ec0ce5e90b39e1da6a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links designed to manipulate search engine results or distribute malware. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://maslag.eu/userfiles/file/vukubokozenapuw.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a3a39f30333be30cc4a940f7b2fedf4e/tepalezofasevuxivejo.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63326302036.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/55479108366.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/52011170963.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69938821106.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/segejuvapa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/22e65d8bf7c8ba21ee966568698b427d/12552217716.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b451446123---19025220651.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/boludotanigemedik.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe9da98ca---jofopokiwofuwokujujevat.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/72316899261.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/31993531923.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/91158884450.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7750dc89---jivipelogivavibejut.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/gawosumujilibajibadunijol.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f65cba872c---1035745888.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609075544ea8c---xunojaxiwulozonenufudina.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903326c9951---xofulo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ketj4bdp5f2mtjpkf75rlancql/57755810799.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/fibevemodejirivazine.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/hcn7qdt9ub84rbmm6gtbsj5cds/zanemifofij.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73248a625---73740411484.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m8cpir2fhef8odume7pm6fj24/papisor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=play+live+roulettePDF 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_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 19336 bytes
SHA-256: 9f30bb7b80375d76a1249f000c7d72c3de8a8e8320a208ed6b1711bca2bb22eb
font_01_sfnt_off0001492f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492F 10108 bytes
SHA-256: 7d78213ce414352d1ee7c95ec866fcc2078a9596f565ae2d97de2091f6c466c2
font_02_sfnt_off00015fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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