Malicious PDF — malware analysis report

Static analysis result for SHA-256 d705f76d41aa2e0b…

MALICIOUS

PDF

93.2 KB Created: 2021-08-15 13:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d1d1432d493838d00490482038f17b9f SHA-1: e6c316d5438787ffa2186a479b14fa791a934c24 SHA-256: d705f76d41aa2e0b770e5bcc8d7ecb3713f5e6ec55104ebf7727a19d20fe5529
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jqf4vujhu1cb6h6rb5rj91vl48/11420910184.pdf In PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/rakidavipitade.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1627439460.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e63b8b3f0b08320ad05892c7885ce39d/benepoguw.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/leliv.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16131090277.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/538294e6d43f5fea48ad479d808ee2fa/76864512521.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090176c86663---57280314608.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/zakake.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/93278194310.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ceb21a545ef9632263ad7db08bf88345/dotorekuxus.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/13632403063.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/mupif.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/77759650554.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/90825780949.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/57388440581.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16107268a76d3d---vujoxuxofowe.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/temizatogave.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/58440264682.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736fef7f41e---runotezavufewiponib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e2c1330e---dinobomanusijisor.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210721085308.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f405b90f---40149319925.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968777db765---pubidorozivote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=phet+simulation+forces+and+motion+basics+answer+key+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 18632 bytes
SHA-256: c5cb9e2685cba0afff5ab1defc31d7987a1e5521d8632b19320b03cd3e4921ac
font_01_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 11416 bytes
SHA-256: ae6633cd15a53ec701a446320d0a7e4ceabd1321acfda8f1f5f5fd23d24bc08f
font_03_sfnt_off0001582d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582D 3272 bytes
SHA-256: 6558553769b1143a9c61c4ce5f31105a191f0f4e7842b0ed25fda7b080931d2c

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