Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c41ad1e20871883…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 22:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0467868df6e68470bd05a91b7d6712d SHA-1: 67f6de1a771325e5b8e29b4c7376c98e2eb88588 SHA-256: 1c41ad1e20871883f44c14523595186a78d56b37b2d2124550baf1a1307b0757
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which are compromised. The primary purpose appears to be directing users to malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fiberglasssupplydepot.com/userfiles/file/2375748362.pdf In PDF document text
    • http://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/jexupikor.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134c33b201c3---38877179255.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/befux.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/76300776110.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/51343518934.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141f4e9241bc---79322108149.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64688646362.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/95530738473.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c79c8965---fajutimivu.pdfIn PDF document text
    • http://edituj.cz/res/file/kakivabirekefonaruled.pdfIn PDF document text
    • https://laser123.com/geektic/files/63838857074.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210914/files/20210914152934.pdfIn PDF document text
    • http://wych123.com/upload/files/fupetelubemipixofuka.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/86357903059.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/vekud.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/jopivovela.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/mirin.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/50359434936.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/turejesefixav.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2121b4840f8d2b8bc2d3603baff42557/febebo.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/wekunumifaforetur.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7792d199---zomafijatokikitare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aurora+android+storePDF 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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 10276 bytes
SHA-256: 1401a37b6dfd95dd86a62344e9b4ac28e082cca3083d741a00d63d90dbf99371
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 17736 bytes
SHA-256: ae02ca312468432186f74ea4d8961bfda157b88632fef0fc11c3c0af0344894a