Malicious PDF — malware analysis report

Static analysis result for SHA-256 a227b65bb97c9def…

MALICIOUS

PDF

93.3 KB Created: 2021-07-05 20:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2e0f0a4726dd4b890164990276e150c1 SHA-1: 305e4f7d7e252d8fb1b2292e9c3edf1e93ebfe90 SHA-256: a227b65bb97c9deffbc173cd082a1255501066457c3c42c1462a7e42978f3ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/64517134495.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f307a60da1---pesabevibapazekujipak.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/65833848fd183e8179c8349bd39e6042/74921494981.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/bumatotigit.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8d502c8326257999b6d0344401c6e9ff/42871501802.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2935b993c0b29060a488b41ec41134a7/55436631305.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf6ea343b---61412578456.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a8122b423b2c3fc600d88eb16fedce91/91157239187.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5135e751deb7973149d17e1603bdf0ef/bizesoravejerutodiboj.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/80608090252.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a972d8c8bbbbee59bfcfec397947e537/kijoxemijutagedavosap.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/liwemiposimeluvelo.pdfIn PDF document text
    • https://cncunse.com/d/files/38328724339.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/70770030160.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce668751c---siwasasapuligarigig.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f12880c74b---82159931649.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/21438392844.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/jezazas.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/sh5gtjia6ier0esps39999d4u6/2243309284.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4df11e450b---jusowik.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc68d7f297---nepetipaduj.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609246fc1fcc0---87024185612.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c60fcb832---87928152401.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bdf5091d---nuluvutud.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/gefekos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wonders+of+the+world+2020PDF 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_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 16856 bytes
SHA-256: 20f21370b32cb367800a7c5b07117741f609f04b40ce4fdfdceba94a30371484
font_01_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 10520 bytes
SHA-256: 3f6edd762962ad48d291fa5bc4da1dcf356419bee96cb73058d06853d525a52b
font_02_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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