Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aeb1b7c2686a61a…

MALICIOUS

PDF

89.7 KB Created: 2021-09-20 08:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0566627faa9428e516d5191392216eb SHA-1: 6f1b26503ee22f5f6b9967a1c65c9d752d13a207 SHA-256: 6aeb1b7c2686a61a2842455a4471947b8a583ae89aeff879880b43989d80903d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple external PDFs, many hosted on potentially compromised websites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/62238555001.pdf In PDF document text
    • http://shyjjc.com/v15/Upload/file/2021910103785206.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/52808337654.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/lifukibigi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614309d436069---wukekirinuw.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631634122.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7452839070.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/31507857878.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1ed37200c47cf887b4ee64f4d82cdfda/dawinamogemivarut.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/10145012479.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vimifagonaga.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f39d0c798c9662209e98837735ad9d2f/zizinasodulir.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/87357883776.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109110011533404.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631521046.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/kenatuvanimefenano.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/84073546358.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/xadiwulesujubepub.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/90564215434.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/36f2fe5fcc26d75de07ea546e78d0b0f/mijaxuwudoritoxapotanire.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/73950252938.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/gubipoketagufod.pdfIn PDF document text
    • https://heureka-cz.eu/files/tikaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+update+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 10324 bytes
SHA-256: 2c1ce1318a1e69544b31453e0b15fe60d30c98eee41febd5113d56d64a3ec543
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 18368 bytes
SHA-256: 656c2cd929ed36e8de634c30ed12bbba15656a038b06210ae9d65a8bfccd0b0c
font_03_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 18444 bytes
SHA-256: d31b46e420216da4a7a38cab257ba5c159e03f24db40c334771e85fc47119aff

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