Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f65d72693d4decb…

MALICIOUS

PDF

71.8 KB Created: 2021-07-01 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97119ce8b80da3e91fa8a0416440f25d SHA-1: a3ec414448b1b311537c46874cb69780c3b7ebca SHA-256: 9f65d72693d4decbb16bd596d1f2a45ce98790569eca3412f70a3660ad7e9ecb
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, with a high ML classifier score and ClamAV detection. The embedded URLs point to various domains, many of which are associated with formcraft plugin vulnerabilities, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8bd549fc---pujovuvivutojogaxedosi.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c1009c9---70983640799.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78ada4eec---71618029433.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e1d8f783---guzenajezekuzere.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607757e61104b---51540967664.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f68e06d562---64719268042.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d1tblvd9sr2498la5q7n3bhcg5/jaseruriwovigidoxovow.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/neduv.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fb4285f8c2b9504a788681cdb2a2178b/40371521063.pdfIn PDF document text
    • https://dm288.rs/slicice/file/81427145297.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/28075368392.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/konujopebujiwigatalad.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/fepidexalesonaxutelad.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/63912511044.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/879f8a975d6b5e910594db77708ea90f/favezajiwasotalimebi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9tghnj6fvs39ao8fk43houta3k/20357617915.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd3eb1bce---36944651353.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9da809a5d69869a7ce409c6eaf630bfe/topowabewefusavonebo.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/29651541626.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1448dd4dc---zutin.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbee4aa58---5750478301.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tekivuzuvusokisazik.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160915a5ec153e---20581959114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=php+execute+command+line+linuxPDF 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_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 10712 bytes
SHA-256: 12e096756817faff9b7db8a1d69269d9faa8975b6e5a39cf8ea8c1939fa12276
font_02_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16016 bytes
SHA-256: 0d659fbb74f471411708e427a498f1a7ff4a9d5346cccb091498de9a80b0d31d

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