Malicious PDF — malware analysis report

Static analysis result for SHA-256 8298a8d819a07801…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 04:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49338c30705e47773170ffba997cf8a7 SHA-1: 07621d93f5da8e32aa18684f4d06e05176eacc38 SHA-256: 8298a8d819a07801aefca62a347f68f1de43521c23897f52611ea1a3db5d9cc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bf123bedd57078ebab79b0b22c7fd85d/30189597768.pdf In PDF document text
    • http://candientuvibra.com/images/file/powufowasefobodoxosiwimu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9e7e93u1g7s4psair2o2ncskeu/21185251660.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c3c72b1deba9a4131cb1140e010c6f7e/voragipakuji.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/dunob.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ff74f1161ebdeec801588dd009c3ce2a/visoduvozegekirimefub.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/fomibose.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122265a69f---64957750284.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/35387523482.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/timisejujudumaruf.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609841e9e20df---93731449818.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/17991766379.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/04a2f67b137a5145fd7bde1fa6b7ac84/75973983203.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/segigogosizumuzodezojataj.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jebejefefiselokiga.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/rugefojis.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/kotikavaxan.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65e87ada1b8433ff6ab8d1a8065b22cc/62127456796.pdfIn PDF document text
    • http://reflita.lt/uploads/files/24041323788.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tf9o7tc9tim5dgre1siccj076c/24612649649.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rs0l4lovol1ug246okeq8qvlj3/nejomim.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/99804880932.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/82037042303.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5151bd0513f706817f3a7a5e7675c592/ropaniguligif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vba+define+array+of+worksheetsPDF 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 17472 bytes
SHA-256: 27e2f01731b090df62fe8149c82fdfbcf59df24e09fa55c8a585fc78563344ae
font_01_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 10808 bytes
SHA-256: a12ec24b87bbb248111a7a3632f291b5355378c33680b8709f1db5e665dd7640