Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ce7c5040722c25…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 12:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc01c46536e055b44c009cfe5c5afc35 SHA-1: 917338cd62ddfe35764d2f84dc091cf823b27051 SHA-256: 52ce7c5040722c2505b1c619ed7f0d6e9a4021f55c267a43d53e82fcaf032822
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on various domains, some of which are compromised WordPress uploads. The embedded URLs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bulongvungtau.com/media/ftp/file/kosexutaxawugazasep.pdf In PDF document text
    • http://x-site.by/upload/editor/files/lagifegaxaz.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/47757225516.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/tazudusu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07fd4b5cb---sevupemoj.pdfIn PDF document text
    • http://llux.vn/uploads/files/8339385542.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51bb1e0f63---pizivobi.pdfIn PDF document text
    • http://asfalon.com/__files/file/judexedakoponelasub.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/71230490046.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/javitexowe.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vibudisop.pdfIn PDF document text
    • https://mmszke.hu/files/file/fetawexag.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/femuzujaberewosi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5389912cf---59168660287.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/babobefabadobub.pdfIn PDF document text
    • http://kotolantopeni.cz/file/lezujatiteneke.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/93466313682.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2e02c0626d22cfff0388e5fb99cb547d/sofonomiderezetop.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zadebikezileren.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110fabef3ca4---28668216018.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vuzatunalupiwowezojixajaj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260a887ecd---97569315007.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36d755f12---dixisuleneke.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091097303364---jikuxuzojojopuxevaxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+a+splash+potion+of+fire+resistance+in+minecraftPDF 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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 18264 bytes
SHA-256: 02f1753b8832aa5c7b88dde038b45038a7791f8066538d878bde6a1f974c0b95
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 10912 bytes
SHA-256: ea627017c022592a07f631c96bf86abf61a29fea9291282ee038fe8594740c73
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1