Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d6ea0e81957a7d…

MALICIOUS

PDF

93.7 KB Created: 2021-09-07 01:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b93f7658aae481ee342a3cd337b72443 SHA-1: 0f016f9eab39e4c87bcea92ed6433aab49cac2c0 SHA-256: 19d6ea0e81957a7de07dd1a958d2439140273b57b7da641d35990376a07461ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are likely compromised or disposable, suggesting an attempt to distribute phishing or malware payloads. The presence of external URIs and a link farm indicates a probable attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://nanobubblevietnam.com/uploads/userfiles/file/65808564812.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f78010e5116d816a914b83726378264e/rexivajuxufivekizewozu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rakulamugujugigipuxuset.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/46545080794.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/30787363797.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/91913761909.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/nutititewunenozisosi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b84a3bd9d---runesa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fpd570deqhcb4nhkq183qsqai4/19233517060.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/ae9d371cab144d061f500bf5d9b3e347/24994431704.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/rarelibijejasaleg.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zejemesuxizojoko.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/f9o3divv1ath54s7cioacls892/1720167890.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/34140689101.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/68886717499.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dafa2c25500---37578641373.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/pixofa.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65700866223.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a9c315fa433a0a5be461434c2c93e416/44559249404.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wutarupapetujimojuw.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021053109003173499.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/65744bb783f786f76d8f20b67786362d/tomoginasesamulebumexupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kohler+3000+series+pressure+washer+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 19636 bytes
SHA-256: df2a6ac1eb014ec7c5374d633201b7537bd7a603e55b9412cee4b9c09b373655
font_01_sfnt_off000137b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCB 10892 bytes
SHA-256: 8f2d7b2cf7362eadbb66dc62da51e036b63c8f1f98fb7dcf68c566fd141721bd

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