Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad27074117e4e26a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 09:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4c8f79cf5684a883eca654ee397ad44 SHA-1: 992ba65cd9d349fd28eb6a47745840603e7821f7 SHA-256: ad27074117e4e26a34fb2b070efb250b7df04df6f711c86201ec9f59cea022b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zimufifipisusapofoju.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/25967256097.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/20202434349.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/3304702654.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/56206855306.pdfIn PDF document text
    • http://candientuvibra.com/images/file/46444421649.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/30808379839.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6c4c4f75---14831126954.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/52359892776.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/23533083063.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/1541512175.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/3094141263.pdfIn PDF document text
    • http://premium-h.info/files/files/vezovolevifalutemowef.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/66262995401.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f66b21e450bde903fe8b06cd8b40d7c4/fanupimofafizalaxuvex.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/78255378414.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/xafezunabefa.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kanuwetinujosadupakegatog.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/powotasodovupakolar.pdfIn PDF document text
    • https://bem-sa.com/img/file/pipukimebixikamedupuruba.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v16iosoj265jd5kl5jetqt8reo/todovos.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/senakopoto.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7i22iiu97hflnskfvomet0i26/40724761291.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16213318876323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=forest+systematics+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 16556 bytes
SHA-256: 9e1cbbdae9c2db3e8872c84e998fb285a60b762eec1f1ae6415f014885ae346d
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10724 bytes
SHA-256: c18ff05d20b5dfaabce4f5d6eb53612e85ceb9461e381c25bb0c4936890d78cc