Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b24f100e294a7f9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 16:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02265f8200eb17f1b9c7133f23763e08 SHA-1: 9cf2197b5ea7579c3d7c9ac65b9fd004ba9e414f SHA-256: 9b24f100e294a7f97fd1529455d53b9e980bc0f476bf46a9b4ec534d5cac856e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=ftii+question+papers+pdf PDF link annotation
    • http://drivescuolaguida.it/userfiles/files/9926467882.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eih7klpqqbd96rmvqrtprlkl7k/98138969549.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/nulitu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609312ca2c180---38721475085.pdfIn PDF document text
    • http://kag.fr/userfiles/file/62235073130.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/55a408518c5af1dcf1de00b53e243ed8/827917920.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/filovunamutik.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/79158288069.pdfIn PDF document text
    • http://capital96.com/userfiles/file/xabudazefobob.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4c80aeca---81715694254.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/63318944578.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/wutuxiriwevuzotome.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089bcd831436---43533814087.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/bafuwenawuxesemo.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6843456ad785efa5eeda6b6506ead700/79876145820.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/72670950161.pdfIn PDF document text
    • http://rld-carbon.ru/file/27653874172.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/48305369647.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078f232cbb8b---jojuk.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/m8fmst6n3e11gf8jgdirjj6gc8/zogob.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f6nr2l1vddp8bi962irtplieu8/sejarirakubu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609262787ed5d---89923815643.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/44269892314.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ih5boemgv4upao153dj02kc061/41058528119.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0d754967---83934163174.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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10668 bytes
SHA-256: 12cd741cfbae6826c9c493d8b0565a66f2275eecd5eee404a66d52ef481ca58e
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 18156 bytes
SHA-256: 39c2dd84161425b32c7c394a63b667995fa1a5c3074cc4a5b26d738df970352f
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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