Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda24d53bb1efa3c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 10:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 158b6d3db4cdabb556e6ddc479f2b487 SHA-1: 49432c63416a6cf55609f725f6528749f4a5ac75 SHA-256: bda24d53bb1efa3c5745ff7958e1ba720ab04730e448636193cd16708ed5d41c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a PDF link farm. Multiple URLs were extracted, pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://coretry.ru/uplcv?utm_term=how+do+i+screenshot+with+my+phone PDF link annotation
    • http://slxiang.com/v15/Upload/file/2021918199241908.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nokotigoruxupedareku.pdfIn PDF document text
    • http://www.pilartangguh.com/file/96525103466.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/nipisujobazifu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/b888f266991e3aa80aef89cbb2d3b359/16376853602.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/86901570931.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161447c4719711---dakefuxawepukiwinafemaku.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/folorodesaned.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/46804535943.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/57537524527.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/zuseminepexajebubeli.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/90998659338.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2q3a6fa66acen59cu4mrcbndkj/84034745862.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091606072750.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/34362080576.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/tirorotovifemonibig.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9e891363---wuwixoromuroxar.pdfIn PDF document text
    • http://wdnederland.nl/file/61036499706.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zomibuwujidemajubaz.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/26559449708.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wevis.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/xaviz.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vetukazewebilefumepab.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/96689456483.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/61148931195.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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10760 bytes
SHA-256: b0951351a831090e063b639bcb7e61634319b6cd87bc6f4215e728aaa9e924e7
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 16704 bytes
SHA-256: 2c0e5f41ebe84a09546342718681ed8d45ee8619f87aa098ec3c417a882565b9

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