Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb24d1bf74b09b4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 09:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddebf47f3fa1d20010eee64b8fe6132a SHA-1: 4b6f38b57fb93d136faac4480b6c42fcbb5d64d5 SHA-256: ccb24d1bf74b09b47005514b818fb7e92dbdbc6122e5a7551791012cac5492fb
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, including a critical ClamAV detection. The document acts as a lure, instructing the user to install a remote-support tool, which is a high-risk action in an unsolicited document. It also contains numerous links to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ketchas.ru/uplcv?utm_term=mobdro+for+ios+download PDF link annotation
    • http://dailyxedayhang.com/userfiles/files/78232883946.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4da63a69---tuvuwowemijofevadudafe.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/86904646552.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/75662519853.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/23473352313.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142268151db7---41024026803.pdfIn PDF document text
    • http://fpole.ru/sadm_files/vimikatozuzepekumaxur.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/34502494288.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tunesodelizibubuloxif.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/suvewonapobebetupil.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b08212c1---76803795104.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/56808270961.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c1cae1dc---saziduwuvizobunowafebul.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/bojawiraxagubefukir.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/39900802983.pdfIn PDF document text
    • http://abwva.com/uploads/files/96369525035.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/24811193446.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/ruxenubojijenazidukumod.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/fazofilo.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/jagoki.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/vajamigejaxiwejamivideko.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/421qqp88sa3k2jnkkb5fburqqr/71746089445.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/1613979291.pdfIn PDF document text
    • https://termoformat.md/img/files/vuxakipovegukunimosek.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 10336 bytes
SHA-256: c7193642dcdfc59730de208235a62fe11890488f6f2b2f17b23b3de25bf3ffc7
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 17724 bytes
SHA-256: b4f2d654f603ea2243e4f7f4064beacc45e8c3367edf4f36eda2a073f9ac96c1
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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