Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9632a2008bda2b0…

MALICIOUS

PDF

84.2 KB Created: 2021-07-28 03:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d5bddb120e6269f4f906e0e932a28d5 SHA-1: 31277008adf32f4558450fc80aa2c693e1b30479 SHA-256: d9632a2008bda2b029b3605b5185b2802ed149b9d8058b79b4f50ba9ce5bab3b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

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://sunpower.lv/ckfinder/userfiles/files/voretomi.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/95536535510.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/vodafidodaxisobogutadewip.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6b5aeb65c32fc21f7713d833b7365c14/10380557617.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/jizunujufudov.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4404e65d6---49125229612.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/75140372878.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e53288af---rolesawi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c8a578d673ada1901a27aa785f88f26/jufuzisaguzuwem.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fac775cf6---rizuvunimov.pdfIn PDF document text
    • https://efnnma.org/files/file/50605403266.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95c791fb---segivu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/8792252939.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c81bcd12f---vofug.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d54345d7600---siloxoruvasu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/42773836206.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/dozos.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3c9b11c53337bbceeab92e78b5d2a644/96474473349.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/32634ab9d8765edbdb10adafc7291299/73659715344.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/sileviterezififobivokopex.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7b918b3f4---jozejibutofuka.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091fa58e9e2f---zolekuburifamojuw.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/odf1iis9s9rrriheu1g6s875m2/zalevew.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/06327b4de2287a88de20a30c6be8fbe8/jiletedexilopapolunepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=state+10+output+devices+and+their+functionsPDF 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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 11088 bytes
SHA-256: 8772d034e79628c7befb49b5552e0539ff9ada1ebf3b70dd5b0b7259eb4f7bd9
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 16816 bytes
SHA-256: 4804b17b8fbda908003fef18b31f4e9b8a6efeadb45c390888be9f36f370326a

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