Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f59f83d42e6eaf7…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 11:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3f9e81a707b0aef5841f976a8b185b3 SHA-1: 1a1990a2bff15b25adcc0ecfa2000902cac9af80 SHA-256: 0f59f83d42e6eaf7def7f3c649e7d60480c7e931d9971463330007e641183a51
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as a lure for phishing attacks or to distribute further malware. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a deliberate effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/01serbp2n5cs0ak0dscetde16c/movuvenijerutesof.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/53ibavabqp0v7ff9utehplqgkc/19078423080.pdfIn PDF document text
    • https://atl-50.com/files/file/28839846607.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/mixutifefibexe.pdfIn PDF document text
    • http://klhl.com/userfiles/file/pimuzapusewowodibitaxoko.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/24f9f79aec998b9b78a65020da0f44fb/4808113462.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3de57b1e---zesoliropenudo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b48eb2ecb---gutinu.pdfIn PDF document text
    • http://hasyo.net/files/file/73467265752.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nukinijosezi.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/maxarobepatiluxopupulijuk.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6dc5ab9808c2c2e1f2baf0d9c3499999/35886740272.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bdede35d309---6802748300.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0280fd692beda6c884ade47ea8a71213/61159353511.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210618_128472C2094EA2C3.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/10659133581.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/25504994768.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/wuridukisejatexobe.pdfIn PDF document text
    • http://ccshecea.org/upload/files/90527435412.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043001525686.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/29669659177.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3e1d66c9519b0ae67661fa75d5d45288/49483652281.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba8d6099---25977460348.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/30ede349152e480c8ceb8ae5a460bd4d/lelababajoku.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/021ed4c0e33efbfa9128bc554cd7858b/dodejorebegovu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf47e320f---95066578707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=summer+hill+wineryPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 10200 bytes
SHA-256: c0f5ef024f8803bd2dd41e39cbdb044160ee5021d50c230f20b1c1f70c9b1a8c
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 18192 bytes
SHA-256: 54855a591a288d31ee3bd991c7599312a3b5c59b4d4bc1c1ed179fb2c2e3ec13