Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2f1d0d2edaa03…

MALICIOUS

PDF

84.5 KB Created: 2021-07-08 04:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 522fb8cd3c742ba1e34e64146015098f SHA-1: 4a0b47977b95dd25150595a7a8a5a69348492fc2 SHA-256: abf2f1d0d2edaa03f7fe31365e176cd622eb8b5376643d7ea108e8e5b3fd9619
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16099b93d6a948---kilirowaleruxigisusenig.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4tmqh72ek02981068eln9s4n0s/senatojiwaxepov.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88d31a4cf---jexekudivitixusi.pdf
    • http://stattus.com/assets/file/23677681845.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b8b442ca---gowipenusewewuzubosidit.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9ef051a7a7333fcdc95d9369d2556dd7/44273979476.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cot8q461ipk37vo40u6pnul0es/gisil.pdf
    • http://alnoorcity.com/userfiles/file/11924117813.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/fukorujolas.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b88cb1ec---1850809241.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be14e026d3a---rofesupabavirixita.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30504f058b7e36d939b59ee8be7cb4f5/divizilow.pdf
    • http://yuhongzg.com/d/files/tuludekexuzikarisile.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a25938a5---56545488434.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/61fdbba8fe36d9e0753b7236333fcae4/watijowexajitumigixofutav.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9805361fec34e50dde5280bc47c92d07/nipofexidenojener.pdf
    • https://banghenails.com/upload/file/banipitim.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e0146d99---duzorurod.pdf
    • http://amirafouad.com/uploaded_files/file/manunakirazefiwajabu.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9cee32d9fb2b9918008af829a271be7e/31260437435.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r6rfuoue4u5g7n696ag5ntmr82/42172868732.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/m3gdlvl6vticovrv4s3h6a2ap5/derekotamokixuxozadij.pdf
    • https://diedacorporation.net/freesiafiles/file/taveposekogakifuzu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=canadian+roofing+reference+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e975.bin
1c6ee6eb66a373522e335cad6e70e7012167854a10762dde7c3af0655bf69d49
pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16488 bytes
font_01_sfnt_off00011453.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 16792 bytes
font_02_sfnt_off00012c6a.bin
20674b9065afb4d5f4ccd63623b658fc4b909648e7bece51d3da3b3c478c71a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 10684 bytes