Malicious PDF — malware analysis report

Static analysis result for SHA-256 909b013951aef89c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 15:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba136211cdf7e1d6442606d476e479b7 SHA-1: ea0c185f464a32c11bf06450e969282f7c7a07e8 SHA-256: 909b013951aef89c242b84f8dccc00472e58a3366a56eedbccf8ad07cf40d53c
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, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, possibly for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=diversity+and+discrimination+class+6+worksheets PDF link annotation
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/fagodenelowijum.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cp4sndorhf50pbcbleeih4l962/lepawomakitanubobakani.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b5eb2450---22212794235.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/wisupanenizux.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d94ee03a8---46004428595.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/64270499160.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/kekekanonanoguda.pdfIn PDF document text
    • http://kalikraft.com/images/file/desadebalubope.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/zezufajudenoraba.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/56264091427.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4f15b862---fizoziwuvakigukotepomutiv.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/xanenolofisupezipaso.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/2476442984.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/65399562226.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/fazewidogomivapegew.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/95433686179.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/wefomatom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f3089935---22089488890.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2e479403c543469f2552caac99b83425/23587856940.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lemekeliveman.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/wosizoxifepogotevewovol.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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 11160 bytes
SHA-256: b1180c690cda4cbb50ef0722bd65463b324840b893b5706faa9e5ed50772a051
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 17684 bytes
SHA-256: d03e1639bbcf8b3249e8aa74ac1be830c6410b3a2dac0d449fb11c304a334b02

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