Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa68fc12cc506dcb…

MALICIOUS

PDF

88.4 KB Created: 2021-07-27 13:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 576e7b7779ed4cfe93099155edfaae13 SHA-1: cd99ca5508b36e03ff39d578b3c31befdcf16774 SHA-256: aa68fc12cc506dcb87bb45b6ae1e951e9d7ed105c3c3d9daf3fdb812289a2071
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fotografiafrancescosomma.com/userfiles/files/gotomibokojopabu.pdf In PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97741773540.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a39a48fb---rulasegedaxuwutut.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/widefosidaduzazaj.pdfIn PDF document text
    • http://aqcons.vn/upload/files/xivogibixikiwi.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/dopojutawopepajok.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/69762120929.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/5586112498.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/84653029952.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160749fbe4dbb3---gunuxugel.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d93e8369e32---xepujev.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078314624882---nesuzorazoxe.pdfIn PDF document text
    • https://shidoremicrosys.com/media/92348454572.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sotizenole.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e739c0e5---25907866854.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e2llqdm7rf2qplbefcmklj2u33/tonimewemunujixuxijo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160799e08665c8---79334113143.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/mujidixidovog.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af44bbaaeb2---78939733382.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9d1e90c3d2513451d0f473e6636c3a00/8651373765.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/60478348333.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/rapulebusosakogatepalisax.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/wadigunavo.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jetumemadi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701747163b4---siwawurepisidot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=descargar+libro+cabala+gratis+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 18436 bytes
SHA-256: f164acb4fe54b3ff892a360df3661e0d3f57bf37d4d568a78a552bbb91be6152
font_01_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 10832 bytes
SHA-256: 23777e2dc5e488e87488787259288bc07229ae856b81dcc82eb381951b3f6c79
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_03_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1