Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab25c352dae1faae…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 17:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc5d7ce7d303c2956f32d93c67eb36f7 SHA-1: c6776a83560f2eba74c7bdb93ec95027d0489e98 SHA-256: ab25c352dae1faae4cdd07f1c1df35e4c363851e29b6abde1e89d1b3bc9a2a06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to a variety of websites. Several of these URLs point to compromised CMS upload directories, indicating a potential for malicious content hosting or distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://benardoutlite.com/admin/fckeditor/fckdata/file/35901614779.pdf In PDF document text
    • https://absoluteanytime.com/media_file/files/files/29101295402.pdfIn PDF document text
    • https://onlinendttraining.net/files/12758490582.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3586e8a869---puxubi.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/17431023420.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516144142887775.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/e1i5p257fhmdea16ivfmqt77j5/1277694786.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/66sp0smedlqkj23o94oemqgd04/fodekunoxasijofuworumupaz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070976776b70---giwelovekazuzamibef.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/36463605872.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/serexidovugigatatojotu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02f470e967---wemirekazewerovif.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/7938783066.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d2522a939b2aebd2ccafa178856ac1c5/limajufuberumad.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2ba7c2ab1ceb06d78d614e90e61183e3/jefapekela.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/48206337104.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088f2d7c64a9---jowiwezurexififupukoka.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/31006936321.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xevugigonukok.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c0a1f09amdt13o1o3tivdn3akh/37031530774.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e790b213---kilolixabotujuderi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6b9b6868f0ae7c9a1c5dc7b9862a4e2b/8470450115.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fcdc9aef9537ed4e3d40bd04ab772f62/50697070570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=llewellin+setters+puppies+for+salePDF 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_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10496 bytes
SHA-256: 0dc5e1c5b835ef9d35a5872fa7e85dbbda3e800d152428d44f25dce0a8bad3b3
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 17688 bytes
SHA-256: 8125403784656309a50280f2b4cd49f4beaeb17ed2e93c9493f76cdbcaa5e267

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