Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba44ae3ac2a9581a…

MALICIOUS

PDF

103.0 KB Created: 2021-09-13 14:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 063ae024e377a3c4746ad8d4b31fd673 SHA-1: 31c923f7a06f2d13acaea6dd41e6ad4e51629f2e SHA-256: ba44ae3ac2a9581a51d6c7f7b18a0a4e762ad909842dce6aaa6e1bbbb46431cc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/35cf47eb2b4c84ca5c2706bb248b4e23/57245972054.pdf In PDF document text
    • http://ariogalospspc.lt/userfiles/file/visixodipirafevedakor.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f451ace805---xatowenabokibibuzefaka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea2b9447f---weboj.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/46852426354.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9j4v507pdqcsaclgc0oksup7oq/1112707166.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/wazutuva.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/kukurafuxufaxi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dae678448---luzofunulopokakepefu.pdfIn PDF document text
    • http://limoride.net/gallery/file/89279993532.pdfIn PDF document text
    • http://contelex.it/userfiles/files/57099136248.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/74820834652.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/jegigiwemezevi.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/73002218104.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3392d4d35---75433744437.pdfIn PDF document text
    • https://cargotavio.ru/files/file/vowanabexepuxikowame.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/sakujikirevu.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/modavumemi.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/83878695946.pdfIn PDF document text
    • http://jngf.cn/files/file/furonejimugaliboregefa.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/69570609506.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/vupewamadok.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/vuvexazo.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/33093487157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=undertale+boss+fight+simulatorPDF 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_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 21468 bytes
SHA-256: aa3c122fc7287aa67cbc1711008f3a0b01a8870fd615eca4fb1b559afacdc620
font_01_sfnt_off00015cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD0 11048 bytes
SHA-256: 33618c99a12c05d6006f18603610aede7e0711f36b320e12df685d378a212acd
font_02_sfnt_off00017619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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