Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fd6c2c082f253c…

MALICIOUS

PDF

95.1 KB Created: 2021-07-20 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 656f92d2b14f5fc84ad740d85d0c7d99 SHA-1: 287ce5b17b87174eab72226f15a630b9cbcc7945 SHA-256: 48fd6c2c082f253c31cb7000ae949587681dd655d4e8253a070b186e90d76108
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and link farm characteristics point towards a phishing campaign, potentially using these links to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0eb23e6bdd637f11d5a8b696235a5328/gawisesudisawa.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3iaj86fbasmo756kffq1vafdqb/75475189006.pdfIn PDF document text
    • http://quaint-house.com/59653094820.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160960f12221e1---fuwelejalizosevavosutasi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/lakusolepu.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/libikesuletoverimuxu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b66e56266aef7c60c39cec038b39c07c/dalolepaxoduvojunid.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c0a3edd19b751be61f71049b12c1875f/gezuxejinupulem.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/movomuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/90021501738.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2e17136c496a9deec08a06b76c9cc887/mixagesuxenaxuvib.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/74987001189.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ab36f08c---nixunebetup.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/196186036.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pusexevejanogiwepevese.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3jo0fj7ek8o1ovu9vuqcub3pn9/fapafu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/meq7ur83memv3ip6l923dpm65s/95359514856.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/70475341354.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15071685dd---76696730476.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/40214829013.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/87634264723.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/metixovudebokupipinoz.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720b6d4a2b1---nivujoragi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kf1q9gq378ed62r3lmfg0a32j5/74120240737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=primatology+is+the+study+ofPDF 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_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 10912 bytes
SHA-256: 1ba5103819790cb8ce28c0c536413fc5786ca941cd1aa8bc25f326658a12454f
font_01_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 17632 bytes
SHA-256: f6b61ef9f74f045583eae820d85b2d1e09222ee6a21fd45449f071274c2621f2
font_02_sfnt_off00015729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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