Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b8abf0fbda8833…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 07:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2155033794c29e422d21c561a1f0d9b7 SHA-1: 41554783e5d609467e3c28bd6defc0ab034f1f35 SHA-256: f2b8abf0fbda883337985e8e344bcbb9d48f663d17d14fe21af7dcc20e355940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised websites, suggesting its purpose is to redirect users to potentially harmful content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=itextsharp+read+text+from+pdf
    • https://livre-art.com/ckfinder/userfiles/files/dogiliralo.pdf
    • https://beldaoyun.com/calisma2/files/uploads/kewuxalomo.pdf
    • http://goldway.jp/upload/board/file/wapegufifubuturopebefolu.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a187ca7a9---nibopopubigudalebakibepir.pdf
    • http://evohome.pl/userfiles/file/vonivumodo.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00e1b5860f---lobevugev.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161164c77b719c---gadomitubabifufibiji.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/92800415430.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a7777e68---werusamutas.pdf
    • http://shreejians.com/userfiles/file/zukiwa.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31659a33fa---zejoni.pdf
    • http://banlinhkienlaptop.com/userfiles/file/woveji.pdf
    • http://studiogiamberardino.it/userfiles/files/76160685235.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bc97e9a05dbc743f40a75c61cc0e9e00/22908586673.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100d8e3dc109---sobemofiluvurefokerixad.pdf
    • http://boxethai38.com/upload/file/pozoputasavobotelivenit.pdf
    • http://lt101shop.com/userfiles/files/kulewa.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/febusivikapavivoxoxofir.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c05b878b---tifomanewunovudumiz.pdf
    • https://vnjhanoi.com/upload/files/46365057130.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa55f4ea6e---41638420477.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_off0000be4e.bin
4184b258578e3c8330d3d3cbb7a39db38ee0f371ad0708a526ba0b5fca615c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4E 10572 bytes
font_01_sfnt_off0000d67f.bin
7bb2271a970d716e83e774a37fbfd47dd93c3734d55ff5b76ee4a60b34424d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 17752 bytes
font_02_sfnt_off000104d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 16792 bytes

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