Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa521173dcdc171a…

MALICIOUS

PDF

74.2 KB Created: 2021-06-09 05:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 002d965dfe7f84405ddfac0a4af1b96e SHA-1: 98011bab4a0c1676465f74a89d25a07c9a0b117c SHA-256: aa521173dcdc171afbe5c16cb14939e1a8d050e8df4f2d48053b0e208f00896a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to song downloads, which is likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://krisoc.ru/uplcv?utm_term=ek+ladki+ko+dekha+to+aisa+laga+new+song+mp3+download PDF link annotation
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ceb20c48014cba3f22a0a029757e7031/relamok.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca32f48526---gelapolilisumedo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdceb8446---95587556686.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/71918816812.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/newaze.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b78bfec7913---89767940606.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/76sohjtl8h44t9o31nu8vo9gqe/98324111099.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/5859963194.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a739560d908---lenuxigipikojisalonem.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40cbccb00f---37123778602.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdfce405f3a9aa0dea62c9ae9de7001c/ronolijalubatokosabitowek.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/49910360253.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b003b52bbe---motibufura.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0ef0b90648ca51a855c04e6661c178cd/23591863927.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b6327d02---peladifakaxuwozasi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e280927e4d---jimefopekalagalewabotud.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3c24a622f633fd93ae5bbd7969d8af6a/mizipeneje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 5552 bytes
SHA-256: e5aec6408646ef530fd6e50e0c868536e2748a21af92ff484662f8cf482f407c
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 11304 bytes
SHA-256: 9e8e9fcc598d94d89778356ea3f792d77d9e7cb4a759f3e1a09bb912404c0b2a