Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad79e1bd1a98a4d…

MALICIOUS

PDF

85.3 KB Created: 2021-08-26 16:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 536e15094f3d343741f3e055a89389ad SHA-1: e7d29ae50c6883c4a8b20610301d027f083288a0 SHA-256: 8ad79e1bd1a98a4dd1eea06d29cf8046fa768e6cc079f38747eaf341ecd3e15d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://grandegroup.net/files/kokugoteporoxipasegix.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a468b03a7---nipinizifusinigivigara.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee48bdc305c---66526973201.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca875e2c66---521785188.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/84954291031.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ba5353d1---jiferowaz.pdfIn PDF document text
    • http://canadanur.com/resimler/files/kegezosogepemupok.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/94932953493.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a618f0fa1---giruxabopo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/wajofozivapobuda.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8cb51c417---xubodetupafagupobaborazi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfa180618a---mozewesaruvesevu.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/48934727814.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/gaberaja.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b8ea0506b---27660867441.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zawaru.pdfIn PDF document text
    • https://termofriz.rs//files/20326286850.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/wubinufuwu.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/86647306025.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9433d63f---22168913478.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/sazosugevutilaseluvub.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b9155bf9e2---juxajusokiwexovu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/75500861200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+online+bollywood+new+movies+2020PDF 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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 16260 bytes
SHA-256: 87a10497f6e0e4bc87e06ae389a560b1dc2863f7c22e6767d590c34f67f37e4f
font_01_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 11176 bytes
SHA-256: 093f8c770a448f0abd36b97f6c0aba7de857af23431a78469c1670a75c9f13df

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