Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee07d5941ba98c2…

MALICIOUS

PDF

77.8 KB Created: 2021-08-10 22:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b64181d7e3b56c1a1964075e1b857147 SHA-1: 7c6b3a37b2a01567cbce338edd4eb6db2159b230 SHA-256: 4ee07d5941ba98c26f34019c95a7644da565c540000f0b6734111d2ca99c0dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=hack+baldi%27s+basics+android
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rlpjmlg4l1ar154njlvg0logs4/jutewuke.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ghco73i9h1ga7a4e43bgsp6567/xemeninotumilezojunewu.pdf
    • http://szao-spb.ru/images/news/file/jegaxarokozexanuxadadir.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb62db8d8---wajogeserawirojufar.pdf
    • http://leebyunghun.org/new/upload/board/files/tadexubirutesigum.pdf
    • http://allasclub.com/campannas/file/pemenefisuvilumaxe.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pnpdpjvpvh60u5h7nmvoudrq4p/11741023020.pdf
    • http://www.europesolidaire.eu/userfiles/files/14426637913.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a22323af7---filorawuro.pdf
    • http://angelescare.com/userfiles/file/51218211700.pdf
    • http://dansungsala.com/uploads/files/ramevofimabinulusu.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55999f46e---80692960446.pdf
    • https://duproject.com/uploadEditor/files/gesisabodaxun.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a1b6d9ba---vunimobomixogamezofi.pdf
    • http://www.ufolep-69.com/contenus/files/12103691308.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2515f1a6b8103af97bc71183b1688a3d/97195686954.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09de97782---malapesizuvebapuwug.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/fokitamosakeb.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b9fe479a57a4ee75524dbca02811eb05/28647890498.pdf
    • http://kunjipsc.com/uploads/files/41550959462.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811077bb0d6.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/batixakotagifurorurobita.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/f28s0e2hm2ruao0jkg3bbaeak5/57003759348.pdf
    • http://er-trans.com/img/produkty/files/metinusavixunisobu.pdf
    • https://secolink.sk/userfiles/file/zabisatibudelolirafi.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_off0000cdde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 16792 bytes
font_01_sfnt_off0000e5f0.bin
df77a210f7794a921ea16952515c0ca592b117836c824691aafe75e69eded6a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 16128 bytes
font_02_sfnt_off00010f0b.bin
cbf84a35668a827c2c8d5b5fc9183d9657d7a2453f213eb6989893a496b45086
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 10388 bytes