Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade11aa0c40bc6bf…

MALICIOUS

PDF

96.8 KB Created: 2021-06-26 15:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 287d2cd451b6161c91c53db91aaed91a SHA-1: b915f34798bb7ff637ba116aa363d53b2ad54b41 SHA-256: ade11aa0c40bc6bf50a7bb0417dc75c93af9820539c23942f0ebfd5f6b227cab
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=ip+router+ospf PDF link annotation
    • https://topclassgreenery.nl/images/file/tebonuf.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m4t04sqhqk52e1l39osh7q0nj7/penidolesidi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c89189565---dedezuxodiludubo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e3c88a3c883f344d9cd4c0bce2c3e687/31060012096.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed59b7da8f---33350015382.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/6998361221.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872928b3195---16592824544.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tugemevabubadisi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/61888821049.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/eob281n5pf85noj87q47qkp4pf/80677120752.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f3bcb28dc59d31dc05ee6917055de767/xogazibetegap.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770aa4e0a34---bekiguwijoju.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/28831623466.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df539961---dagakabavajowenedidi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-26/20210526081721137697.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dc14a154---1288653980.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/basojegowamejolobok.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ca4abkpov5aobs04vdmhvulfp0/kigesijuwasunobeb.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1kuqh1qhldvvbjk4budsddjrnh/wilojerejuxuvemoxes.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98cd83e0e---99953735396.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/56509157454.pdfIn PDF document text
    • https://goodline.by/userfiles/file/47369344312.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/54330757534.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622198705.pdfIn PDF document text
    • 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_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 31720 bytes
SHA-256: e76c8536a62829e26f425e6b2286d716e6546e82efb7487004c1515690283dc8
font_01_sfnt_off00014637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4D 9996 bytes
SHA-256: 2e9c9b54b4c33db2ade6a1f26be3e06862597b16c2969212693ac1ab01f51733