Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a2e31154d473d8…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 19:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf46f2eba75953efbc3df0888142ccb3 SHA-1: 379a79e45dbfef117b26ebbc918ebd7be631c299 SHA-256: 61a2e31154d473d8278c93c568d16ef6b4b9f6c2bc2ae690a64270b512ff15e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised CMS uploads. The primary URL suggests a lure for downloading a game, indicating a phishing or scam attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=gta+san+andreas+game+download+highly+compressed+pc PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0ad48c0b8bae5bfacd5b261a01dcaf33/90684274940.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/tujawag.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/vefuxezalimakizoginoz.pdfIn PDF document text
    • https://asi-filter.pl/files/file/12680051674.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/751f06f1424bc9d78647f7456dfc0749/mimitibagoxovad.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/fidudojaruvuwigamaz.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/83509188606.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8468a5bab74882a81bcf1a1ee4bc0056/timusevesusup.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/de2fffa61c06e09b7b5a5dc38aa29ce3/33626927944.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072003183742.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0531db30aad3e840838d7d4c33a4a1cc/97738668785.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jofaxomibitovuzezamoge.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nomamidebasudelula.pdfIn PDF document text
    • http://www.bash.cl/media/file/46339640475.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/39828399525.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tebodipon.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2813ba8c0b---63890198028.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dtas2s05p288rh6niraagg77nt/21486436487.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8560645a31bf0a6150b083fe526ba7/bexejavelunanixaxodadep.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28f53521---rurinitajajegasuwujuwujiw.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/60556040632.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_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16572 bytes
SHA-256: 12ea0bae1e73b6087b22c0588360597be592c913085adf220c445ae9cbec5e54
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 11200 bytes
SHA-256: e53a84f977089045434f17c2781019eadae07b2b82fa66c2a565f3f5df65785f

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