Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da465ba82921245…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 10:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5d9bc59b1f8441a393a8e8ae0b29863 SHA-1: 67f660ff446bebc85dc96a60ef404db8754940c0 SHA-256: 7da465ba8292124551f3150a4cf02f5ffc162d5ff0ec3d15f2f1bddadd5715af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a high number of external links, many pointing to compromised WordPress sites, and exhibits characteristics of a link farm. The 'Fake CAPTCHA' heuristic indicates the document's intent is to deceive the user into interacting with malicious content, likely by clicking on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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=pixel+3a+android+11+release+date PDF link annotation
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/83700567006.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6e1a4b86---25855573040.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/miditulo.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/92221443098.pdfIn PDF document text
    • http://jucal.es/images/file/77234669008.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/xidukexibiwoloxabok.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9av7pa27j3tsui143r6e3f7b67/43595005862.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/11169990805.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/duminafogipanuwoxofonov.pdfIn PDF document text
    • http://villkasz.hu/editor_up/rafanunaboje.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/52407830753.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/4870659520.pdfIn PDF document text
    • http://web5gstore.com/Files/files/30428943876.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/6005164145.pdfIn PDF document text
    • https://alpinashop.bg/files/48288968201.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/gupodenemet.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/38930488273.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/99122655103.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/damugigume.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurewivibebavokutogituz.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4be59630513da44438ee5262503db6c9/38897909120.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/it4s037qgmvr8sr9gco391f7lt/20184721846.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/lefabapugubofa.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613163fd5edbe---85970624564.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/88445490954.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 17684 bytes
SHA-256: 3528a14bbce468c0363151d36ba65c4c781de7257f00f76e145dd1bd27e02a8f
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 10568 bytes
SHA-256: a3c68efab40a9b83a1b52cebf67cb11f1cfffd3f716e53a21d74850f20c4cd0f

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