Malicious PDF — malware analysis report

Static analysis result for SHA-256 899d6c986fb9f200…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 19:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6211c33c6592621d4a92ccb3cb8f772 SHA-1: 569693c14f5518ac7292f47e18c1c6dc5029c124 SHA-256: 899d6c986fb9f20023f269d3c363cb495c49fb73433ad03be36fd5e11444218e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=unblocked+games+run PDF link annotation
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/nazidevi.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/fulur.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/49384325898.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/79040961315.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614958d8067ba---gebagukewimukugexajuwu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wolelomer.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d49f8e6ec0---fuduzow.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/tewobokapaxovuzimapu.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mexenadawodobisediwozu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/34889725620.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16146abcc8d9e4---26795521501.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/128d79fcd7e232c5d7a2c4d287320af7/dovebavajelifa.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/51074713196.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/32354255190.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kadawodawekuxobulumiwit.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/69724113003.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210902_56164F82B7FDCD3D.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/16764762311.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6202454f---54305458341.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/6844633076.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/9704729247.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/74403266991.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zugoke.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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 10860 bytes
SHA-256: aacebdbc3a77e4a7590f4114db903539eed37ee9842b95b3bef4d443c052b940
font_02_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 16092 bytes
SHA-256: 803dbb0eae2df73d9f880234b1f24e05627c5911477a1ddce4587815dac3f0e3