Malicious PDF — malware analysis report

Static analysis result for SHA-256 044e5a630af2f792…

MALICIOUS

PDF

88.1 KB Created: 2021-08-03 01:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22d4c1bdcb316f86f754af6432bd846e SHA-1: 485810e87d8203a07e039d5b23c6705155868283 SHA-256: 044e5a630af2f792dfc43a3d1c6a1a9809d5ab8de79d7ef47a313b0d980efefc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The primary attack pattern appears to be directing users to potentially malicious content or phishing sites through these links, disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=the+last+lecture+ending+summary+by+chapter PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13531d50a---72191007430.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed8ebd3a9---zetodazapodonekas.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ebbd04ead417bfd26076e8e40a95c2fd/fuwifamefixuz.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b752a7941148475777bde0a036eb7d7f/63845312746.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/viderebetavokixekiboriw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98bb1375f3---33023934387.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/1113129537.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/65458645346.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090946db1251---rojukibigusevitujufiril.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/98525223916.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2c7aa11e70b9b37dacb49e5a29f8b086/29772024817.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sazikakel.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2ad774265cb7a8f43a983a5761e63fa3/lediwevupe.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49699b209---bopedefuwufanew.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/tigemekiledotipibutugisex.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4l6tm7rcgno56tc6gs3cetbhga/23145898274.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210618092824047.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ee07fce---62903290314.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becce2bb148---dosuvutuzawoxezusajetaxud.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/zinikave.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/jesunawojovesulasajitegob.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a899b91c3---92662598042.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/39287197931.pdfIn PDF document text
    • https://flomogroup.com/upload/files/kutez.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0c7d4546---fafabeperanotozinutupag.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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 17780 bytes
SHA-256: 2ef463ffbbfd3161a9f71c3bbf2e54bc91ee206c156eca0c3688e8fed96d9d6b
font_01_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001398c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398C 11160 bytes
SHA-256: aa047767daaee97d653cf23693c27146dc835ce18ab25a1d998ea93ce34d21a7

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