Malicious PDF — malware analysis report

Static analysis result for SHA-256 06310ca8504a7a80…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 02:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31d310b72bd103290b20c361606a4589 SHA-1: 2df11ba56c8b9a3471619ac3d81e24702fba40a9 SHA-256: 06310ca8504a7a8049e9727bc668c408e13c7174674dd9e748778a2f39a3b555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many pointing to compromised WordPress upload directories and disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://philabc.ru/uplcv?utm_term=how+to+measure+the+size+of+a+circle
    • https://rcot.org/userfiles/file/nuloxi.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f312c9172d---84515904991.pdf
    • http://malagi.pl/user-files/fck/file/fuvigoloxenavozivejeguw.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660cba46fe---78415254665.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74c9b3e73---resozuxizezafos.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2e1ee262---15913240823.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1n4qefd551s0t3sv594idqfcp4/xapolozesanuri.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f25ee8d80---10169325344.pdf
    • http://childconnect.com/swi/fckfiles//file/99103028080.pdf
    • https://hizlipin.com/calisma2/files/uploads/bepuwi.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1e88869bea980a904dbfd9c2b216744/mumigi.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0fameilq7euaoibdv68v6ttfm6/tolopu.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c044f911051---lukagar.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/t1mmet72oopkkv8krsf5j4dlvl/biwijamazolis.pdf
    • http://geyikkimya.com/userfiles/upload/file/33455298826.pdf
    • http://csc0451.com/userfiles/file/20210611153013_8ymw22.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0f4c13d2648e1f34b3a6962076b7f3ac/65687376576.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e8fb4f5c---70233525123.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/09355dba1bc81c8e451dc2874d994e3a/sefuzagoporojikasidibopop.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/lowojevawomutetuxarinip.pdf
    • https://repare-ton-smartphone.com/userfiles/file/fijofelasunegosos.pdf
    • https://giolog.biz/images/bulk_images/files/62457777355.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094130918dcc---62967454995.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ec5d1a9d3df930ef19c914af6665f8cc/5417951868.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7a97554114756a5a30d8d1d6a76c3134/kepuzokado.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc4cbf286---84057826188.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_off0000ec59.bin
2ac2c57ce852a037145b04b1263f230275a7c2a11a7953f6fdf76870782b12a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 10736 bytes
font_01_sfnt_off0001051b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 16792 bytes
font_02_sfnt_off00011d2d.bin
62e85f15f79c11a10d75ff047b208a3c0626417e11cecc4e55c27e363c322091
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 17192 bytes