Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b970ad6a4a7052…

MALICIOUS

PDF

76.3 KB Created: 2021-06-30 23:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a46cb75e60e55a44658a7d9de6289362 SHA-1: 53143304b7eacbe96b778844112b53da83bacc37 SHA-256: b7b970ad6a4a7052350a25f0c2cd2f820854d5c191df7e9ce399ab382f8d83e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The numerous extracted URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=what+is+the+formula+of+multiplicative+inverse PDF link annotation
    • http://bindashnews.com/userfiles/file/dodipimeloju.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/lumimalaw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72f8e85ea---dozuw.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fb2215c5---73594029247.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/mgu2n52sf60qub28ub1e1aulan/tabuluzapezawuvobevikuki.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/69298f1eae60d7da643096f5299b6235/galunigukomepi.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/vavowexofadovejivipi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/pdide9hq6eb1pm425fdtgdkpm5/mofodamaludoniv.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/sipuruvaturozer.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/semavavironidazo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160777edf9c8d6---rofezobamisoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef2f0c4646---kisuwokefemujoderidodobob.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7472d19e---72638265307.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/vizazu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/zomuwulimotoronaxexade.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lonunorun.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b689dc142573c970cdde1c2d8e204ed4/gujemekebosasagope.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071350e2eb0b---vametopulinupe.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/10581955789.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/savikusikixiredowujovefuk.pdfIn PDF document text
    • http://bulmarconsult.com/files/lusarezifuni.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2839517288bd93909963cc4adc9a8bff/28502019258.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d4f0f167---boverasulo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a153c2b1---jigigifawad.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d186bb04767---sokavininadogesaxin.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_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 16776 bytes
SHA-256: 8f90bd22625b278ad1c8cd7402ab614784e9aa55a3296269050b1898f66e4b0f
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10904 bytes
SHA-256: 6e49b2afc0495aadc94869975ebb75b34f20493faf0508ad07f55a388bea0d87

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