Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2424b34c92b10d…

MALICIOUS

PDF

105.1 KB Created: 2021-09-09 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 725e16e9c361f3b0ba38eddedb502a0c SHA-1: c9e626f2f3e6435fd8624c45edb8f6eb488ca204 SHA-256: de2424b34c92b10d9bdb27d2df7029047284ff3f069ec8f815a195b590eb5f60
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to disposable hosting, suggesting an attempt to direct users to malicious websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://chcial.ru/uplcv?utm_term=fast+furious+tokyo+drift+full+movie PDF link annotation
    • http://mdbim.pl/ubezpiecz/obrazy/file/vebedemabirofedixifaresel.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/raxizazapelimavezori.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/fupiwuzozerusere.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63519915438.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/mijenanelalezojanato.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/zuvoxixu.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/finoj.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/soruxedevupusif.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tupuvolirapelani.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/40807128100.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/wonaxazativumamewajedo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5498a980---momoko.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/vuwek.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/7398518229.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f24128f905c243d5d5cec9d07876412b/wikokaniraru.pdfIn PDF document text
    • https://yodobashi-church.com/31198523014.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813ec3c1c1---vapejusufusanupo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/votobiwuziwudorovemotar.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/moxuvutusamixu.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/bedemenodakufogupibe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161345a00abdd8---20143556393.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/medovosupawo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2fe79ebfa77e92863879ec17174922f1/jumedotonixujusigosoxexe.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/nunakopiroxitizexukikiwod.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/riwiwugulevibefon.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/97584315100.pdfIn PDF document text
    • 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_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 10760 bytes
SHA-256: dfb3c239b47e499905a29ff92437c69ab237dabc65bd03b3c4ce4e027deec51f
font_01_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 20104 bytes
SHA-256: 0d5f5003eac5c9e6769711fb6b003f74ddb561e4f29cad4f8ec718717f5824ef
font_02_sfnt_off00017df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1