Malicious PDF — malware analysis report

Static analysis result for SHA-256 395fe2b748893346…

MALICIOUS

PDF

103.0 KB Created: 2021-07-13 20:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fe8f7e21e8eb1cb68b19edeb4a0689a2 SHA-1: 7776eb9eed6410fb6b6f6198964ccb411831aa9a SHA-256: 395fe2b748893346bb247d737ed1c268a5bbe5c7f922557185d503a72cb62e3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=thought+of+love+in+english PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5cd5749ee0236ef51d8bd4600905a02a/kitonivekiwewolexel.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/buriko.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/903a85048f5343d7cb89e0860bd6b5e1/49500307789.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zatuwoxapovinazusisek.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ceef8a98ac63d89b7ef3e551eb49f3c9/94126228798.pdfIn PDF document text
    • https://actorconseil.com/files/file/fefog.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vemulepojekoge.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/89621521447.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9359e9cf55---83234254107.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c6aa49f---74220604924.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/jagivunasose.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1f690b19---34793129831.pdfIn PDF document text
    • http://recviem.ru/img/upload/nekajaferirutitavoxup.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6712a14d3---pisedaxifelon.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/60261100156.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c2555d1b92d42ac502a0eb445fa0ff95/muserezerovik.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/1211188953.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077d066e0566---58917827724.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7ccbdb2f---kulita.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/gavokojirapani.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52c800d54---78142958722.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/27679849682.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608244bea4b87---22889963520.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/23351840168.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/78864587682.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/jukutif.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1cff98f66d896b91870de04af41fb619/bizowidajefekinavapo.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_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 10360 bytes
SHA-256: 0d57407a9acc7305f32dc936aa470dc3785b675aa0464812275f8e49ad0e1bd0
font_01_sfnt_off00014799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14799 17920 bytes
SHA-256: 08f19723dc8a2773c711bbe324d2f2e11514332d74cc69612f337413f8f8c29f
font_02_sfnt_off00017667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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