Malicious PDF — malware analysis report

Static analysis result for SHA-256 5699483811e26447…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 04:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c980e664f1b0f0d76ed4be1806dc294d SHA-1: 2f0f7eebd3ce22b1e81f39be0838f8889e14704b SHA-256: 5699483811e2644796d470c1a75c30c7731a44349f5733b8e6dace6266deb1a9
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://studioindelicato.com/userfiles/files/13081841701.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3343939041.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/35630308537.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5shbkod8mei3nmf5pib1v51uc3/gogef.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/93482040006.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/10820087464.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/917ee490d895cb381a3385cfd7a99d07/rusebevame.pdfIn PDF document text
    • http://bscartridge.com/pic/78142251568.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/40005357903.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083151353dbb---99562101915.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/1593951261.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0cd299716bbe40ee09bf1cd717a2547b/xusipawemadogol.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c401354bc---76283772073.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/34779724046.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cee438d22---73698989312.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab476899c4d---nunorakadabowolemoja.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/41331040861.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/mokibedawuwesolizobiw.pdfIn PDF document text
    • http://dgjst.com/upfile/file/62452022429.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f038b10dd---53604971235.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/derizekejojitupafepuzem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=early+acute+cholecystitisPDF link annotation
    • 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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 17256 bytes
SHA-256: 715ce4d15f2dd5b8121372c9f36c901c849e2822a8bf784a0254dba8c9cec190
font_02_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 10420 bytes
SHA-256: 765e0e32a8b52760a2cce7fe1ebad5efebc8eab2c23617d6935ca665e6469f85

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