Malicious PDF — malware analysis report

Static analysis result for SHA-256 d669da5c63c783cc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 22:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd27e33ceabc493f0532c1293a93d66b SHA-1: 2cfc36246538e18090f69966aa27ddc24694f250 SHA-256: d669da5c63c783cc5b8295ffe9df881138f3e473da9b54fa25f2ca45ef33d8de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vildmarksjagt.dk/userfiles/file/34513175116.pdf In PDF document text
    • https://studiecarriere.it/uploads/file/58150206653.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/gezuxitudazexifojofes.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fobaxitir.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/43128431277.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f9209406ca0848f2ad17ddcb81dce5ff/95483793916.pdfIn PDF document text
    • http://lse.hu/userfiles/file/10877420285.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/numojubafura.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/atrqgs86bbutbmgckqr8l99rn0/10987605620.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zefunupekesirazuto.pdfIn PDF document text
    • http://mrybalko.ru/files/ximenovoxeruw.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/44716620345.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/47434212833.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/tiguxivewufodamuvofik.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/mabopoveniluguxiv.pdfIn PDF document text
    • http://tiquital.com/documentos/file/vudebasa.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/binudokapezisazonugoke.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fpoql3jg4a7crsmb27qvs4o4a3/xozikuramo.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/24979982175.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334f1d6db2d---10871448435.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/371fff78d20d068e0d5fbd4ac54130ae/fesofujubafereveniwag.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3b22239d---15689777857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fast+and+furious+9+full+movie+torrentPDF 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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 18784 bytes
SHA-256: c6de10c05e7fcc8b13623f4b18a4a0b1e56f03e0f08a921be34bc6c0affcde0e
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 10828 bytes
SHA-256: 0b42f9b257ccc5a8c8ad2e79381448dc67751b6a6f6b1d0aeac99cfc865dabbf

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