Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1ef45be8dd89f4…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 21:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0195d385071dcae60030da58186bd478 SHA-1: 6acf49e0b940ed251aef89e92924794d9405d3db SHA-256: 5a1ef45be8dd89f437b6e0fe4f3d0204b5d94a19ce8abe7befe90148799d5034
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for malware delivery or credential theft. Although no scripts were explicitly extracted, the nature of the links and the lure heuristic suggest potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://foodsafebox.com/ckfinder/userfiles/files/20021813874.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609474554f057---29330435559.pdfIn PDF document text
    • https://airshow-bg.com/file/9978620707.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4ab03e513cd19dae0caf5a3a5a61d5db/rigufezozewulokexelobow.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/xazojogugifududemoxemajul.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hvp5j4phcmuckge2kh3nqipv22/zugapilikinupotuman.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1fe9924ead9069223071202212544210/30921632161.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fa1d77ee926c5df13efaf369da2f6993/27161860276.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/masekozinumuxetofegivur.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4a23c08ab9f54938d18da180fd231bac/vobovesuke.pdfIn PDF document text
    • http://chinazzjx.com/d/files/sipiwarafimaba.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9650a9f9---waxitubul.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nobanatuxidekixen.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/rupepigufakuzad.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/saletunanodibinadijabaj.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210626174318.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/mozaxexadamed.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607575428f3a6---kovadijizom.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/82392964987.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f961058d5---wozodozevuxalilodeda.pdfIn PDF document text
    • https://bamor.org/userfiles/file/34303616990.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/23694616458.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/drao04mtplhqg9nb4iiavtvnk7/26247060706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+whatsapp+latest+versionPDF 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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10496 bytes
SHA-256: ba103a8fe64f8e13a3043a56a2100bf5ef38b32a9aa93f50a5ccb46d437c14af
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 16820 bytes
SHA-256: e6d65d914b85a3dbc614dea18479197033d1484cd1a5dc3c860971c3e1a945c3
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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