Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a6bd58144a9731…

MALICIOUS

PDF

91.6 KB Created: 2021-08-07 23:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd236f7580687e59703e1e1a15d16302 SHA-1: e2d49140614fd0d2cf7a9962e5bd1d478edfc925 SHA-256: 10a6bd58144a97317251cdba84cc69520a04d591ff9a5bec48173dd0bc527be3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a method used to bypass gateway scanning. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/javekaxuluzu.pdf In PDF document text
    • https://jotekonybakterium.hu/userfiles/files/zolarubemopatuni.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5fd40aa98127a6e982fb43756d4c8055/95342544994.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7dc8cdf8662781e8e84c5f2b1ca3cfa5/waxox.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1915d56fd7bd5a86e970a8bb9b32e59a/16242498537.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b634ecfc2---beripizipabubusib.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/modokisiwopifel.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/19aa9daghpld3odtdul4vuqo0o/gakuboxutivuvutidosorovi.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/valobode.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/24188037112.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/nemunufozegiropo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f53cjle0b7ik4hrhqgh42i1o97/vabinojejuxexekoraja.pdfIn PDF document text
    • http://ndt-ultratech.com/files/66526387285.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c15ede73---nuropefufupipojigujaba.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g7vk3e71ftd91mpcglle0dgkp0/66502821237.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/parubozewi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865d983f911---nogotomibazegawata.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84076575448.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608206c2a4933---18957511785.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fd23ab08---bukiponavu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wuxakupi.pdfIn PDF document text
    • http://boxethai38.com/upload/file/kawotisefepavotagitumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=alien+shooter+2+reloaded+mod+apkPDF 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_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10852 bytes
SHA-256: f6d74ba934fe3572becca65ed3529a36516db18b63c0abf21f3c54e7938129d8
font_01_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 17640 bytes
SHA-256: 0c96b8e10bcd0ec1530d33e9a34a61afa6ee40b1a644e294c1fd373696c2b0ae
font_02_sfnt_off000147c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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