Malicious PDF — malware analysis report

Static analysis result for SHA-256 7333a533b89cab69…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 16:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91eff16d20ef4befdf2f9f38beb0542b SHA-1: 9c9582aa89540f3a35a9f3c6e5f1fb826978a9b5 SHA-256: 7333a533b89cab6920b9af5304e168a022f6fad4aeebe9b2dd41ef3dc767ffd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or SEO-based malware distribution campaigns. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=structure+of+the+stomach+labeled PDF link annotation
    • http://vitalchurchesinstitute.com/files/file/gonuxelikomakiwudodovubor.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/54702807900.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210916_6C2C98EDA7104113.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/28906773390.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cf63a872391de29ad7b6c1ce0df504bb/zabakepawisivape.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dukedisef.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/87396516509.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/61998130432.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/labarugo.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/6050072796.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wawulakekuxem.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa018013d9---78395081658.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kamuzemagiwefet.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091007431749.pdfIn PDF document text
    • https://svltv.in/userfiles/files/76431510927.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/deminibeluxuxapekuduno.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161323db01448c---tubiwa.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/vifulujukefefisixarunupu.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/19498640928.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/js0mj2hp25gu6gn8tdr1n55fd4/6170944694.pdfIn PDF document text
    • http://goldmustang.com/files/files/niriroso.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14d32c0e4---lezasitasebuvutom.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/69606438330.pdfIn PDF document text
    • http://mariancozma.com/_user/file/dapezonewokozerobozug.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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 10860 bytes
SHA-256: 60ed5cc1a99318b116808898574d3bf25a85d3f7113d43626ba7a0dc8536b5fc
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 18056 bytes
SHA-256: 73200442168c02aa3c5348afa475ee71f740d0abdcd2af23d2cf24d471608a10

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