Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52966a4b660402c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 17:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1369d9e15198deecb148c5d3bb2dbb28 SHA-1: b9db2aae7e81f8d38b9755ea98252c6c886a3478 SHA-256: c52966a4b660402cb7fd311741ca6c17884cbadd7ade47184df5638cedd9ecee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of multiple suspicious URLs and the heuristic firings point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cf681b21---33442522980.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/djn6tsfq5avdbljau2hvf21c80/vuwutuxudixovusuxolam.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb946cb4d0---gabapetozesuradu.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/55105900151.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac95ac279---bopewagenebi.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/49762562989.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/76ac854725b5f73e7667832d80784039/nikosikodezasevil.pdfIn PDF document text
    • http://954move.com/clients/4890/File/57184462075.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/32638146914.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/59864488489.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8528d343b---12221359596.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/50501073973.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee798de50b---gunira.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/75672921413.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a98gmmfnlr6chatke26g2iefon/40322345699.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1b956f65e085cf311ddb7ae8a0d81b24/borat.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/072e789d7828a40092f0fe9f7ca7bf48/tifinotofozoziluli.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/28781118898.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/57997656041.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nujigamamuf.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/43513726113.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd387d896d---satabaxawus.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/78732284214.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c92ef157---10895843002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+remove+a+page+number+from+one+page+in+wordPDF 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 11008 bytes
SHA-256: b7bf5e109cfcb66385c3cd7717c10d1e7d4e9b178fdf1bf716c0cba94a9d7cbe
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 17224 bytes
SHA-256: ebbf640c5901d49fad102faa34992baabc839da259f7eb48ad606bde1ac330d7
font_02_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1