Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09cbe21ba6e0767…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 00:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6d9d1b96403124ee2c803f31d40869c SHA-1: 572c864717233a8db30e1e1fdf70ee7953b9ff6d SHA-256: b09cbe21ba6e076740d3b16094a052d6f1ae422ef012def65a685e31fadb461f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous URLs pointing to potentially compromised websites, suggesting a link farm or SEO poisoning tactic to lure victims. Heuristics indicate the PDF is designed to appear as a download, and ClamAV detection confirms its malicious nature, likely as a phishing or trojan delivery mechanism. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=bse+odisha+9th+class+physical+science+book+download+pdf PDF link annotation
    • http://auto-spec.ca/fck/file/36620764730.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fidefuvixusixifofezuzafu.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/60005295074.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/rakixomezigunilad.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/fazixenamikuzulobu.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/34479196252.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/nulinokojawanimorimobuvid.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/1417871723.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/43260076329.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/kininage.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/85756245099.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/mosezo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/v2hv270ag86t5jlt4ula5v77cr/59916239853.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/malitufapebujimoladoxu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pidep.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124f9fd65e50---leposanunidatofadonavaz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f628d31c2e6---7905652157.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nirbmddm6j13rhmi4ng0i55h42/46527128385.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/36586635720.pdfIn PDF document text
    • https://giustofiori.it/file/gamigovoxew.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wobipokemunabuwutuxi.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vikeritumofuwozubit.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/novuvixivuwop.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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 11268 bytes
SHA-256: 12aa68a80e101e778608eec5afcc84a040a0088d023a19950fb5a82585dbcdea
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 20324 bytes
SHA-256: 1f66550bd6d51ced34d5448ddc5944b93e3b6c7b6034111a50e35fffc3592566

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