Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8e905ee81c66be…

MALICIOUS

PDF

86.3 KB Created: 2021-08-21 15:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d41b4465cf301f6e7f3c2f856beb8489 SHA-1: c14baf663b944dd257959695a3b6d1256ca18736 SHA-256: 8a8e905ee81c66be5652ec6a94849af47c2456fa344e017722bef5b45c1cd7df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=%D0%BF%D0%B8%D0%BF%D1%8F%D0%BA%D0%B8+%D0%BF%D1%80%D0%BE+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4 PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91c009f3b---56894519990.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/9690e9c86cf632758b27db5f63ad63be/81565256619.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b816ee1e2c---mafitanaverugufibit.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d666uvhklkv0ifjumv0m6bob70/xobel.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087462a1a43d---26316856395.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb943723d83---vilakigudogizavaniwopozav.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nawanalorewolaxojoluzi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac840d8f129---66243283560.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/79697781103.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/kuvibu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2872c0e2d2788481309fae452e7916f2/bapepixabasajixuwubot.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e70a81207---13536232879.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/744e6f3172d28ac08871956c2771b1ba/fefanagazulerazedivutan.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4d0aaccf4eab9254e21676cd29e2a3e8/20867168544.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/15139076348.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/benenuxixurupowevuxejeb.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44797254286.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/90061856616.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/zofaxaneguzix.pdfIn PDF document text
    • http://primaneighbors.com/userimages/11665969979.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/timirazuforif.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lv635q4lo2e8sbqcgiimser7om/81941698941.pdfIn PDF document text
    • 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 23064 bytes
SHA-256: 793b6374ae91d675647aed4054ae6b70413c2d2f7292ea5950f7ce76309f5ece
font_02_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 10048 bytes
SHA-256: 5e7edc9c2e3a90b9a86e05728f4a4b38254999f04f30df69356b5e6d878b8581

Open this report in the interactive analyzer, or submit your own file for analysis.