Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f13ec4d002ece15…

MALICIOUS

PDF

81.6 KB Created: 2021-06-30 21:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 273279bc577b8cc5f6d22c3e51c4780a SHA-1: 0838353668f833075e72bf48f1198f71e70cff0d SHA-256: 4f13ec4d002ece152fce0ce9737ced6c46dd6150bdeb76e48b51b7734b270e9c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/99agsavqi0tjhmak9t2e1po9qd/pidel.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b35426dfc---11588665214.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608076dd06710---4843857323.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/27be78uf029kmlitb5sl46oulc/firosavezapagujetapeta.pdf
    • http://vimbark.sk/editor_uploads/files/xusosotixurinorobutulavod.pdf
    • https://anmoul.com/userfiles/file/dipefakosibiwaveziredu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2d89501f681a2e138b2c4884a45e8cf4/rijowobu.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/moborubad.pdf
    • http://absolutelyneon.com/userfiles/file/88191432011.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7da558f465---21268045493.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/42462881400.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/bomanetudufibugebexi.pdf
    • https://repare-ton-smartphone.com/userfiles/file/fozutewisisutedizu.pdf
    • http://tecsun-moscow.ru/docs/file/44378312244.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/blif8mj5gdad5io61b2a69v0b6/bumimosudezuvipu.pdf
    • https://protradingindia.net/userfiles/file/30388399664.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r5capgbh14hs7sgcp21q88osj5/fomugugemizuzogu.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa033003c02---1266256207.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fae8eed8---zibizuzegoza.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e99264499e58ab53dc33d38702153b86/banadalasuluriwopowigu.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aec1be30a---karunasoxiwow.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea13dc9b8---ximazolelefanokakoviz.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f35535c12ec8d6f6017b92fa87bedc3d/13631475598.pdf
    • http://brezov-gaj.si/uporabnik/file/23025393190.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/6i5nvitg2jcv5936u7l55cqlil/mawigapisivuwotelijuket.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pain+in+my+urethra
    • 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_off0000e1ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 16792 bytes
font_01_sfnt_off0000f9e5.bin
575421c80284560d303aed2b059ba1b5c5fa15f284e758d7e70cc0fc7c2b9880
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10252 bytes
font_02_sfnt_off000110b1.bin
fadad643a67d58f34131a34f16039b879579fc923c33aae81d11f47715f31617
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 15988 bytes