Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc93cafd6173b764…

MALICIOUS

PDF

81.7 KB Created: 2021-06-28 11:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a660ae9c92f11f929faf21b4e026562 SHA-1: ba10f939093eef0094add7efa34666aa59e4c043 SHA-256: cc93cafd6173b7645b5090c50a3f7b5c7087d597caad9b3756fd1ca4b3f0435a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics indicates it's likely exploiting PDF vulnerabilities or using embedded scripts to facilitate this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://philabc.ru/uplcv?utm_term=management+a+practical+introduction+7th+edition+pdf
    • https://ebooksweb.net/files/file/sazewupazotexaxoti.pdf
    • http://klhl.com/userfiles/file/difenobubixu.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/26497a5563cd01fa56f204c43fc168af/66067542904.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e24de27a---91409448669.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c321ab83---56265061760.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cec9dd879f2---litelido.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40a97cd339---91421988876.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0afbf023f1---mavutonatab.pdf
    • http://ideatity.com/ckfinder/userfiles/files/kewemalikex.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d2402ca720---xenonit.pdf
    • http://cdkkck.com/uploadfile/file/20210608090516.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f6d26d5773a181c1fe7695c03cc4a6b4/surubifapeneduwew.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cfa24303---75416444216.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d8966858742296df3e946903c8fa4e41/25148828119.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/62f8a6d40dd8f1a720fa249c62c0d3d6/pezevafuf.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/koh1kunrjocg2lkomcfdsaprc5/20866742176.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a84910b7c---kurimivozosareloxum.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/kuzalojed.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bcfa09ff---tokugolitefokelavudejiz.pdf
    • http://asirakademi.com/resimler/files/98264861112.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/glq6nroj7mqdnoffketlsbmldm/jiturezelevixe.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a167dd6b1---vojavit.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1e3u5nb1mtann932c2hik2aqb6/29574041955.pdf
    • http://446888.top/userfiles/file/xabazox.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mvi5n9flnseajka4sn908u7jqp/73261228168.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0224c07b1a6635fd033fb3efd3f0565c/vebofaxadasafovofij.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f1c6a01a.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 16792 bytes
font_01_sfnt_off0000f2fc.bin
b8f04afaf6bc53ba81445b6b9ce28f0c2d6010332e02c1ad4b3fdcc453163e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 17100 bytes
font_02_sfnt_off00011f7c.bin
797c6498891021e97d197cd708cd0c5f2083f9136e40c9491276a0a303f4d1ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 11044 bytes