Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a22492ac53ae88a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 07:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4a87b573ec56d24c73bfc85344e9e9bb SHA-1: 15ad977e771b07c27004647eb00b731be6b39eaa SHA-256: 2a22492ac53ae88a400d515478bb60e9d81a3071f123ef449ffb71d00023ecd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9977

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://daechienglishpark.com/ckfinder/userfiles/files/18998524314.pdf In PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/75191066450.pdfIn PDF document text
    • http://seritour.com/rsm/files/tesib.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pufut.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d44f45550---xorolimenu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087a63e8860b---32068683772.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dexosofomosisobip.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/44bfad44e33a478169d4f1655a26cbfa/81922331770.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/gidotuwofizugeguni.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/nivojex.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/24769384733.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0l7rgimlsepie7bfh26d5leelj/nimemi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/8904344577.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/61183867702.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ed89b617eee077c2eacd0003f6c4b9b9/kukijevuvoti.pdfIn PDF document text
    • https://beltamas.by/content/Files/93398028260.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/60753273697.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/89276012867.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b440353451---31455023757.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/90012093202.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/81983143199.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/33885960910.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/84994259410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bse+holidays+2018+list+pdfPDF 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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 17756 bytes
SHA-256: 90837ebd80482af3c12087d6c68942f0e422f54083a27e99b4fe14dc4a2d7b51
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 11060 bytes
SHA-256: 405eef0d16a6b0ede27e058b8d705a06572e85d3eabc51d7056efd624e67bbb0
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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