Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd50802a715087a4…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 15:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3f804fedbf6d557b16a048415e998c3 SHA-1: a1b399bb64b12a6606861acdb8c05fc96d4bbbda SHA-256: fd50802a715087a4bb28b31612d02c98ab9996c7ca0b8753faf25968b9d5d03d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ak-oroslavje.hr/files/34756768410.pdf
    • https://zaragozadenoche.es/upload/files/pipibediwa.pdf
    • http://verynailscm.com/user_img/file/40452667987.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/h22kd5hel1ftu2be09hb6lkedl/27402160942.pdf
    • http://www.pattyn360.com/upload/forum/files/48595124017.pdf
    • https://anjingliar.com/contents//files/dogorafetipuzavi.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/sosimegowukupodupa.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/puvimadovexumepugineve.pdf
    • http://aeronautike.com/userfiles/file/nituvakubi.pdf
    • http://appletechsolutions.com/userfiles/file/66932785557.pdf
    • https://xinpayflow.com/ckfinder/userfiles/files/neselog.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084371a6a37a---78499026453.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/90530354081.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd5be4a1f---52176324425.pdf
    • https://la-klamm.org/userfiles/file/89543097094.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98984336561.pdf
    • http://a1climbing.com/userfiles/files/janidajojitonejorobifov.pdf
    • http://tipiland.net/upload/file/23011575436.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/boroduwosarijari.pdf
    • http://epodhajska.eu/UserFiles/File/24876805441.pdf
    • http://szakkepzosiklos.hu/upload/file/47755938965.pdf
    • http://agriturismolescuderie.eu/userfiles/files/55281788639.pdf
    • https://vanrun-it.nl/userfiles/files/kiwowelibome.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=piano+sheet+music+book+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca2.bin
feaa1c51da37ea95d30733c7b44d5983463eb0a957960cee35ae2ac3ac83fa80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA2 11172 bytes
font_01_sfnt_off0000d650.bin
dd53c0fdad6925d56feca54dcfd4be46b3e1e93280c98bbae035f58fe44b58b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 17100 bytes
font_02_sfnt_off0001020b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes

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