Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae18e879713a3fea…

MALICIOUS

PDF

198.3 KB Created: 2021-06-30 14:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e730bfe7bd4135b367898f8bc295990e SHA-1: 0e5f8cb62e3132c0854cec11e213b3b63e4030fb SHA-256: ae18e879713a3feab70158d8606b1505978c26b10dbe35b1083c2f6ee92b742a
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, with at least one pointing to a compromised WordPress upload directory, suggesting it is used to redirect users to malicious sites. The document body is unreadable, but the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 5

  • 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.
  • 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://atphp.ch/userfiles/file/kavemopet.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tce4eoi7h278lplr1j8ra5iujt/nisusavusi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495656a344---7031910274.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fc0a5eab---17689991333.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/26290962014.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a327628ecd5---dowoxafavitilenitekudet.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bb03da6a462328c37abdcd31a6c9d2ea/minuke.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/15125660033.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/62167970247.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/5837989650.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60752415507.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079089cb3487---11033794323.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/13253274440.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/53418480958.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/75226932999.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/ribagazogejewaxexoj.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/dufinod.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/15033141814.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c5b4b2b1eba97fd7cf4cfa0b86846735/miras.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/rekamizagazu.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/55193854196.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fususaneborotoxujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=class+4th+english+budshah+the+great+answersPDF 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_off0002aca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4BF 10844 bytes
SHA-256: 0be533e80a31fe59fa6813c1541f0469e49e258aa2d1e751a7b5bf7bd7855f8d
font_02_sfnt_off0002dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD96 17380 bytes
SHA-256: 12c110a27e01a8a9b43c3080a3b2a4c7f2aad8de82dff796f39073089e177341