Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fcdfe864b1c3cb…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 22:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 697cba9f6e5d522538521cfbbecb9ed9 SHA-1: 7151f7ab87a579d5f0e5748d62a10330f53e22fc SHA-256: 92fcdfe864b1c3cbd7f9a39d69e955330d89f29a7558ecc5f8466c4a974be4f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://smidgel.ru/uplcv?utm_term=beyond+redemption+meaning PDF link annotation
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/38283846314.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tgj8gaisval0p5jp3vgv33j5io/64424590931.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021102143267414.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/bemexajerazajemit.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-4/20210904051233106897.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a8ca55e31---mebibata.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/76805768158.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kubiseruxeritop.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/4157502227.pdfIn PDF document text
    • https://svltv.in/userfiles/files/kukozetovojuturato.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/61065285167.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/86388169187.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/39044678866.pdfIn PDF document text
    • http://lovesenergy.nl/file/nirogizovuwewomafupilut.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/9168287388.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/zuvewisesekuk.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/mifogefatisejex.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210913_230947.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614275ff8aaca---38033369714.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/bivizewujevoradiv.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/96615480508.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021092521120273499.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/manimudu.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_off0000b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 15140 bytes
SHA-256: 809eace96be9e3e84ff2c1f138142a4741d951551b1c2171e7f194b4956a689e
font_01_sfnt_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10688 bytes
SHA-256: c3cf4eee4607a64bb1f8ce0aaea7523f0d270b7e19adc681ff45a2a937e31a87