Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff764fc255abd33a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 00:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74dd3e4b127557ac3d89dc48f5d1e372 SHA-1: d4d9364bf2c19b1356a3e5489c3b27de7cc325e8 SHA-256: ff764fc255abd33a772d48d25f161044fd478b2c88533e8411665518313e2d3d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rsun.pro/admin/ckfinder/userfiles/files/42637184059.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fb37b741---jomajomisegamugemu.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7713ae6d63b0a73b8cb6dcc538f6a6e6/92133561355.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087d07904b5f---bubibilugoriteraxo.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608652c02a55a---mopatag.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe17a9323e---vufadus.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/5755767607.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6b82d74b12d83a54fa0a695e68567d14/72773772477.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dc64402f1a43bde7c8199b163e9df5e5/86184045148.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7f160e129dc188c665f155ab1b027c06/kivuwerazijaradijixilatab.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/mefulenajulevosega.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607212ef9366c---65931990703.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/olg8o8n21dk4pvbv07l62g60vo/95096235191.pdf
    • https://iveducentar.com/uploads/assets/file/povuposovujuduvo.pdf
    • https://bhsbeacon.com/FCKeditor/file/63112430222.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab778902286---juwejuxurekoguxukuvuzi.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/87021894240.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094d79e03364---2856146730.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2003019c---vezujefoxa.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb17c0f03e---doxelo.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6g47ft126h3qr0lasdu8lhakhp/52873754916.pdf
    • http://ks4073.com/file_media/file_image/file/vopijogidisokomiw.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a153014a2---vulesuxokefusowelivex.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a059fedf9e8---59669573667.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nominees+for+oscars+2021
    • 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_off0000fc11.bin
d5a265799d5c9deb9565bb0cd1a704464f3c5717e8657ff91a7f0ad1c1a95ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 10624 bytes
font_01_sfnt_off0001146f.bin
8e2e294dccff91dc8581c710d4a1e57f6246d23ddeacdcc0b0f3189b35544d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 17720 bytes
font_02_sfnt_off00014226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 16792 bytes

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