Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba867efd7160906f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 09:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1eb58ac40b37a39aef0c9b80203c604f SHA-1: a350e683498449dd56e2d7ccf82c7470477ee82b SHA-256: ba867efd7160906f8648a6f225e615f121cda0599184747c17fccfb7c5e230e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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.
  • 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://shoreluxurylimos.com/userfiles/files/koxigiralodepurojukisak.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141399bc7549---vofetugevetuxaruxuduxe.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/93babc33159e4281e109965398f1250f/36291032175.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/60798631182.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ab89212d---mevesomegenuvonefija.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/kupukowoguforekugezoda.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/rijukegigubizirubilet.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/4885936379.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/52551581837.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/41081033015.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/13993173876.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911124406276.pdfIn PDF document text
    • http://langmypham.com/luutru/files/61635869247.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lb094ghbl9d29cge3r9d7l4nf9/fodikafunorudokutonet.pdfIn PDF document text
    • http://air-con.ru/upload/files/pedeke.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/31236194054.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/nabogopumaligaviribin.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/738b94148544257cde37ce09b4a3f247/60384862559.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/nawuxenekime.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109061712049517.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/witapavuvosekenage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mi+box+3+chromecast+not+workingPDF 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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 18984 bytes
SHA-256: 138b774ccfba1663d966f576191a22988100c52e4c70ac9c1b978262bdfa3816
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 11216 bytes
SHA-256: 79cd69328f9bbc00650676fb0f3fac1eea1cb269fef667f89714c8f5aaea720a

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