Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8144233087cbbf6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 19:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d0169321b87e2618fb96954ad35d74b6 SHA-1: 284e171e11c6fdcd8cb8b6369b31b1d616957117 SHA-256: b8144233087cbbf681c4cfb96244b5e0bf16aed9fe8e7b6b03f829cdcd5b5689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pibijurusomavawex.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/97691ebfc8ee997ec35adbae9caa9017/77469420759.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073b89286fc7---35209290601.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/46466677198.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/74142482802.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e3a08e1ef3e652cf1483d01debfea5de/16726916786.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/sedamujo.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/83191589012.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3f47c25b---76821378008.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8f9ed5ba---sazezewebaduparivakeluxis.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/40389081043.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/jifavutavozulawapadegok.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/jivexemigim.pdfIn PDF document text
    • http://mesterek.net/tmp/69367089446.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/85339472198.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f56eaf480---nedopamuponajemodez.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb5bec34d---wewijoratolusajaxozitun.pdfIn PDF document text
    • https://aokman-drive.com/d/files/76840081309.pdfIn PDF document text
    • https://p87.hu/files/nomuboxupubes.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ba04e4ff---zataberuxukakiwo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e98e05280---67734228001.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/finerigeguxativekibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+editor+software+download+freePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e799c3f835f11caf735ef79ae19923da/72842468806.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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 10432 bytes
SHA-256: cfcda696883f38f11ba22b90795f4b7a179ec6418f58f21265a4b54d6e451858
font_02_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 17220 bytes
SHA-256: c681f61e13e35f348a33ecd1bd4798084bb1f9a85b7012a05e950f8c6aa74e61