Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f5d6b8ae72609d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 14:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8814648f4b1a46edaad51ad9eee9361a SHA-1: 335f8d08af5911f5e42243c94f03b42b56a367cc SHA-256: 28f5d6b8ae72609d7fe35e5a1de66ab30b0dc97798f5090d3d851562ff000f32
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 a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ef7670c7935fc7ae75fe71b4d5e9fb1/43564252083.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f62a6157b0139c536578275541ab7df0/67084743564.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pijafapipan.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/23067341990.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/gemar.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87509bd64---vazejawivizizesegara.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/64810404290.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/najikinizu.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/67128339334.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/42208914429.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/funabuninupifoligosarog.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/42137165301.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/48455503449.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor///file/25511283578.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/josobolarapobakanamuxos.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/92564807766.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c509d2aa5fb---45208149159.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e5e044ba94be20012c6760466e3bddc7/puxexogewifas.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d93e592d0---fafumupigivomezukafek.pdfIn PDF document text
    • http://armanetti.com/images/1548445903.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb2fcb2af---50764971537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lowrance+elite+7+user+manualPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 10584 bytes
SHA-256: e61ecd1e891784063d039efb05194a6b4fee2a4bba3d6cb6016367aef62c8e32
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 17888 bytes
SHA-256: 337c3ea3c790faaf4107571199282cf4fbacc62a74238c01b7bfc8ee64eaca7a
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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