Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57e6c026928dc2c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 22:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 659ae3bd40932de08788c0202120d004 SHA-1: e28190113c874b66a64526a954c66da2c69247e4 SHA-256: e57e6c026928dc2ce8c989940285def1dcae9f2ecdabed9ee4cfca917418404a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://piannocreativo.com/js/new/fckeditor/userfiles/file/nobamorag.pdf In PDF document text
    • http://kodemari.info/data/files/55851063007.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/7833352851.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/gubebije.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/61644011995.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/lisuki.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/jepizo.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/52415230983.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/36618908342.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/magesidididesub.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133672d5ebbe---29449801835.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/mejipivulifiw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bef1bad9b---35038443283.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kevowumar.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/33682098901.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2cd013cbea4d421f07500ffecd4f0108/nonuzutoduwiwikobutek.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/kawazazowikogarafunubizor.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/21936122068.pdfIn PDF document text
    • http://santabruna.cl/upload/file/1144880826.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/74228518413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=universal+tv+remote+apk+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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 17220 bytes
SHA-256: 5fa0d1dbf653261924b555e4bbc8cb6666d5aae5f0d9259bd2775a060c24abab
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 10804 bytes
SHA-256: 4635a0c38f7723bc585a49a0a2b1cc5dc93ad27cbd00726e0ae6d5ada1bc1daa
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1