Malicious PDF — malware analysis report

Static analysis result for SHA-256 3393c25c6494a9ed…

MALICIOUS

PDF

85.1 KB Created: 2021-08-30 15:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7575246d224342eea1c37110c15dffb SHA-1: 35a817451d180696617852513c95087615787106 SHA-256: 3393c25c6494a9eddd6cfaf398ddedc170abff7a5c7e567d695d3985b7c5cf3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further stages of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160760ef14a8dc---15797596201.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8d7cea74---26571091089.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/ladizonulemoregivulade.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/luturitujixiwoxurazuwuvo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/231f72d844ec7aaeed906b653e47821e/25359498443.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/sikemomamabuso.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rekibiwukilodugujamari.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/tewise.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16115e0b42bd72---majugatanubosuxob.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/vutalelujimenafawaxeke.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/2341601667.pdfIn PDF document text
    • http://progetec.org/userfiles/files/wosugumo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085855cbc7dd---64499178126.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/67561952652.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0798b5b3dc---74364360475.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jululiwukogoziwawozufa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/22087720110.pdfIn PDF document text
    • http://linza-market.ru/upload/files/10477888406.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/96558927515.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9c4f11626---33925953266.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/zeruvugulevosorejezu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/megetemevevexiwof.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b29194285---pijepogovebidisu.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/89152928889.pdfIn PDF document text
    • http://momsystem.ru/public/file/sulezomijavafazipujurofi.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27508011186.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/pesoritizokasaxupilogave.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2ab18ae3af504ae8bb4ee4e32c5f5f21/72988566035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=easy+deep+dish+pizzaPDF 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_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 18484 bytes
SHA-256: d1b7a50c4fa6d3685eb19729a556411ddd7a6f32299af09cfa7afbc593cede51
font_01_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 10180 bytes
SHA-256: b4da8744e1bd36878ccbbb264f60379e381c2520d39b6d792463ae9fa0779f77
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1