Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22febf2a361f08f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 05:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0163ccc9ecb75394b4299c013402b84a SHA-1: 384b7e517d62f5c38db7983e5795326688a64153 SHA-256: f22febf2a361f08fa136766a547c1ff2f2d83946451e2b5910a5ae7036fdf991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to redirect users through a network of links, likely to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://orvositudasbazis.eu/images/upload/file/muradikemafuvadix.pdf In PDF document text
    • http://wujipacking.tw/upload/files/23860753674.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/6605439183.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d457bd1ec7dbb63872cb8d494ea89a02/52087348267.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vuvululuj.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/86629225261.pdfIn PDF document text
    • https://izometal.net/mm/file/96734321171.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/podakewilowefolovin.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/98275188775.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vegenawofojojitu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/70653837286.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sabopifi.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/37580349023.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/ketunavexedazitadave.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/11521997971.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e57010c8---83656346330.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/loxafa.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/69219395970.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/317c11b4de4ae3fee0eaf85d6f38c7d5/bafosil.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/30752279843.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/zuwuk.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9201588a---47545120267.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xefudesaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+update+vidmate+app+downloadPDF 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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 15884 bytes
SHA-256: cb019e45dcd00ec6ab86032c03a6d967655dee44db17a3350fc00d7c76c1ef6c
font_01_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10516 bytes
SHA-256: d74eb4d6743466a4411f2739d756df4bafe22e66884d785d0c5b236f3a54bdb8