Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b0ba92203c6a2e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 10:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bab7e984a483129f1a22b8db84ee8a86 SHA-1: fb7a2647fdf245a27c5c0af697c587cfba39640e SHA-256: e7b0ba92203c6a2eb2b84b968c84fb6a51b6f67bded70f81eb464ca096a5b168
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on potentially untrusted domains, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of 'utm_term' parameters in some URLs further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://inwebjor.ru/uplcv?utm_term=how+to+download+gta+5+on+play+store PDF link annotation
    • http://maekuangudomthara.com/ckfinder/userfiles/files/66530879150.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161442f7e1432c---mamafenagamimugaliwikisep.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/75126078650.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9004145490.pdfIn PDF document text
    • http://usmleworkout.com/files/file/kazutitebenogur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9075a1ab0---8118670111.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/69707406880.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/88775292245.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/47164845120.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/10363376523.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/pusifemasesemewanemideru.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e1c902d18ee384b94f0709f9293de3f/busipupudoliromo.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/jopezikoxujiwapifoj.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/49411167943.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/duwutusek.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393f9e4c9b3---gufebofusik.pdfIn PDF document text
    • https://olterus.net/contents/files/tuserozopegofa.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9ebd2ce8e5e79d8b4b84de545d375203/26244576029.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345ea53ac66---23418806847.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/70273420770.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/95417985057.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/tiponuzule.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41910868305.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_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 10800 bytes
SHA-256: 3f5348637baa16d6bea1ca50e98dfcf3aeea8aa4bc3a1e49b8151efd25f9a6a9
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 16940 bytes
SHA-256: e3a1d023e076d93c7b6da07223df092cd9a43659fedbf0e8b4cd0a9c6c96c7ca
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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