Malicious PDF — malware analysis report

Static analysis result for SHA-256 675e81cdc51367d2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 13:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaad99a5e71706165fbc26986db87b7d SHA-1: e68d4e8750d3d3f969a003019670611cfb6eae1b SHA-256: 675e81cdc51367d23ab085dbbf34a7fc38a40c232b23d31b768af195474c5c05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=earn+to+die+part+2
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7a7d4e61---53487034445.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f3beb5fd9370c6f665de68f1dd3eee1b/14041838798.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395bf31edcc---nigajuxupo.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1098360b6---vuruwadekemop.pdf
    • http://dfanchem.com/upload/files/15353300673.pdf
    • http://kavtas.com/images_upload/files/musebaxorumobojapo.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/31131208177.pdf
    • http://sva-jeanroze.com/xmedia/file/wazorajovovafojinibag.pdf
    • https://keluargamimpi.com/contents/files/sabagebimabeviri.pdf
    • https://sklep-pinokio.pl/web/uploads/files/73103312363.pdf
    • http://umbabox.com/userfiles/file/donatevixog.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/lilemuzumesutoxo.pdf
    • http://miskolciharsona.hu/pictures/file/mafinokijiro.pdf
    • http://ap116.ru/userfiles/file/50416551347.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_11A3A6C901938577.pdf
    • https://civilkontroll.hu/uploads/file/44079361662.pdf
    • http://f1-rennsimulatoren.de/userfiles/file/36916580703.pdf
    • https://cingenito.ca/upload/editor/file/40370146716.pdf
    • https://ipekyolumedya.com/resim_galeri/file/42172292647.pdf
    • http://barbusci.it/maisUserFile/file/vixukofavumasuroxajazi.pdf
    • http://disonde.com/filespath/files/20210914091503.pdf
    • http://psycare-spb.com/userfiles/file/52509082029.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/12025242011.pdf
    • http://kochamsushi.pl/UserFiles/file/62351850558.pdf
    • 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_off0000b739.bin
891883d4c2b3ffff2101f1a05d51e29b1b15cae9536a8fda72abba4a6d6829c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB739 14888 bytes
font_01_sfnt_off0000dc82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 16792 bytes
font_02_sfnt_off0000f499.bin
51b1f5031804a43541b19c05ab67693a342a11d45ddf6393fc249dcbd7931af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10272 bytes

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