Malicious PDF — malware analysis report

Static analysis result for SHA-256 419b3b82b5d23920…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 12:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d888e989cae6dbf5407cd36e4c032fcc SHA-1: 8e879c5aca2e77cfb587a2b99bd52d2038fb2712 SHA-256: 419b3b82b5d2392019ce2c034ac3ff6217fd5691911c8681b55adf293b5f1660
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://greenmodels.ru/uploads/files/28830145426.pdf In PDF document text
    • https://sistemagestiondpr.com/userfiles/file/tavode.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/xuwijuru.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/16536956972.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/57391491969.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/luxerajewojikaf.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fb0afd6ba26af9047538ef66f9347b15/kovuvevalefurinetavituju.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fovugadinagitufeganixigol.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630623819.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8e4e83b93626080b2cd97cfe7bab57b3/jetuloluta.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/feronazuxupa.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/19146027018.pdfIn PDF document text
    • http://caythuocnam.org/images/files/muvuvojitosudibitu.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xozabamidujiroviduluw.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/83906119892.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/62250554732.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630763762.pdfIn PDF document text
    • http://ausafe.net/images/art/files/11146786792.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/nazuxanasesigavuxosadomu.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/birogivoxekijilofudi.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/sariwonabifevuwedaledoka.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/19436891454.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/kejutebijawedapivufatesa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161380b0e1ed4c---xuxapiv.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76233222061.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25155445851.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/garodefukeweribilopinemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+windows+7+home+premium+iso+without+product+keyPDF 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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 11224 bytes
SHA-256: d0e27dd0d53a798eb94667548440926a64885919b82714e0ebcaec7a2a1ef265
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 17944 bytes
SHA-256: 2807965e3c06fb0c87f36985e2c8814c2d6d0032d2f6e15e1a2151dad4021956

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