Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab8a35d27ad0b02…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 23:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce3bd0e9c853f01b54856b67a3d49674 SHA-1: 6128c7cdd83c3ce072ff5ce05940a9f2c89567a3 SHA-256: 5ab8a35d27ad0b0277941466de68a09186723d908a919a46b6907f371914c034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://castel.lu/userfiles/files/33661631962.pdf In PDF document text
    • https://letajicikoberce.cz/userfiles/file/vinoke.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38134024682.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zokukusa.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/21971575999.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/zovidoxezelufenutolowu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e637f43268---69397171402.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417be666d27---bafove.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513e1238cd---34263614202.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/90932949383.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/97046342278.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1e8f0d4f---judome.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/39170569801.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/84ee0aed016d0b32c7f879781c2e3f6c/xokexuwimenowewud.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/muberuvisubiz.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210904/file/25280235030.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/luzedos.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/89519908825.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090605193536.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/pezotejerosomojodepa.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/darifewowago.pdfIn PDF document text
    • http://poorclarescork.ie/images/bedefilog.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/84295242966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=friv+old+menu+unblockedPDF 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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 18120 bytes
SHA-256: 960dec729c561ff33a4cdcc2979f24687b9405e4cf36ea7873edb0da66ce6a7f
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 10480 bytes
SHA-256: 112223ad440ae2845d9c5d993b8a621d21769a38f21c3bfa34a30d6ae85c7045

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