Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf0b2ec589d2098…

MALICIOUS

PDF

89.2 KB Created: 2021-07-09 03:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c108f9c12b2125ef059a3b06a4ef8773 SHA-1: 03e6e98086d924f987892978215bc1c3e41328a4 SHA-256: fbf0b2ec589d2098ffc4368fc6d4bc7f1eb7ab0694c2c73c4e4efabd430233b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://villanakarin.com/userfiles/files/45774258600.pdf In PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ei99g7qqv0brvoqasehkkljdq4/japasewuwi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/48223565c8e6e661a51d29a8d54464c0/fojukuke.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/27823004640.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44319363830.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/6080b5848dfa400162bdf865006c0a63/1838448065.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/71924010061.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/wufajikajaku.pdfIn PDF document text
    • https://nadamasristorante.it/file/fazepoxawovowudemuvafof.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ehaue9irjv3nu7hmegj3j1b3l9/xepesetubon.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69a32a1ea7---46269876115.pdfIn PDF document text
    • http://ymmicro.com/files/files/19260919103.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/53f0489eb8eed568e005c75f7acd8535/gugutapujelupejumuwukik.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/97b5417acd266f096e41405817bbd7b1/53744022005.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756aab0489---21324105627.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/rowibatu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf003e932d---kukogisevidaxuduma.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rhnujf3amf4oumena1u7l6mrjr/fufowujumi.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/66793779040.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/73079052972.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/98581196035.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/95o6t94ub2f983tgqsl183ks33/78794833864.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29058558777.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/11423171864.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867021b1567---35128488044.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4b5cc15d1943c225e7f92def0e185d2e/1631401886.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae1fb9d08---bezaw.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/84555001552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=average+selling+price+per+square+foot+by+zip+codePDF link annotation
    • 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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 17224 bytes
SHA-256: 35b2e0488020ee0b882b1a45105720fac1c3b8041c49f15f39afd58254a08246
font_02_sfnt_off00013cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 11400 bytes
SHA-256: 074bfa4f524b3e3810b2355920114ec3b3167b08bc6866c77785522d77aec2f3

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