Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fd69ca29487ca5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 22:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2a7f322773acae6a6bd011c7582eff7 SHA-1: 6c505c2dc4e4617dfc513b561c08875f7d07b20b SHA-256: 96fd69ca29487ca5ff3be2f781c44ea4bf33969d61c4505ccb779aeae828be3f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=the+cat+in+the+hat+in+spanish+pdf PDF link annotation
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/wojenubisar.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8098f5990de02fc856ab24378e80709e/vetirimogenozaver.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/81028490556.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/dexumulewivebegewiwava.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/xinuxureneforozuzikewibu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/nixuze.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/nakebuxawaxajir.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sefogezujefugosu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8b6165d---81067504038.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/vinofi.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/xoramabunuzosevumowo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a2314e9b8000e674a8a5911326608a22/81565037247.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/15456378e0c7eb202be285b9fe98350a/88274958063.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/gekadajozovi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161379edd71611---7318439772.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/57863047583.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/nudibesimavatasige.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/53726773161.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sukinawu.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/nogedetofituterow.pdfIn PDF document text
    • https://airxps.com/userfiles/files/lerobifokodibe.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418e9aa1457---wosigogoronusatuv.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031520311278.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51442999740.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pigudawen.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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 10416 bytes
SHA-256: 54581215c893ecee83c35a4ce2338615a2ec163a727a99875fc977af53f09ec5
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 18940 bytes
SHA-256: 4e657066ea0ae8b365b1bcfcd5689f4e46af49da34e344889e5aa12950c4beff
font_02_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1