Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eed3c034b8d7a27…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 19:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3312112578aefc59fee255ae64308eb0 SHA-1: 9aa9361d730f8c08b7908e3f8899f4ce5c118354 SHA-256: 5eed3c034b8d7a2740c8ea92f459f7e509ef5af2a6649875eaddee998c28b909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, likely intended to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=install+play+store+on+chromebook PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613176076127b---53895915034.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a0e1aae5---fivadaminimifofomun.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/senube.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kugisisasoviginewom.pdfIn PDF document text
    • https://salwangurugram.com/files/2178826963.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/82634189985.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fuvulusirulibasuxoteva.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/80254223212.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/sidoremigemovelog.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50402329060.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sajibexewufof.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd0cd073f---gisulafizudosebusedo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/24447cb93da062e4dbac58a0d6069cd4/58507577048.pdfIn PDF document text
    • http://philipsphotographystudio.com/mojipiwuxupimidodisibi.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jibeberunovelebigijinusa.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/8992290483.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/zipowovuzesukobamokigovo.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/8725533911.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361e3ec2a04---gatuzafimurutab.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/vikoputusoj.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/derumumuto.pdfIn PDF document text
    • http://travellerisland.com/files/tewujexobuduteza.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8p2d1bjncvacublu8iaqljuph3/30585183080.pdfIn PDF document text
    • 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_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 17884 bytes
SHA-256: ab1a454bbc4afbc6b9033ec9da953ac13801ff2c3ad8239e5e0506c4e7562d2a
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10844 bytes
SHA-256: 72ece59e58d0d53822e0ea0ef1920ac0b4bbdc89ae37f3fbb90244c91242f46b
font_02_sfnt_off000130ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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