Malicious PDF — malware analysis report

Static analysis result for SHA-256 8690c1794fe3dfc3…

MALICIOUS

PDF

86.1 KB Created: 2021-07-08 16:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd1668357b86c349404671bbd5693fe2 SHA-1: 7b161a57d125a52c631fc19cffd9ef6bfa80b329 SHA-256: 8690c1794fe3dfc353c15d3905a85b62cb852a20bfc9ba2d3a026979eb22805f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and numerous links suggest it is intended to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rumito.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c58293a60fc---63741348758.pdf
    • https://proxus.nl/file/86972829298.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d2902b3e985---rofawipogilepi.pdf
    • https://scanclean.bg/upload/ckfinder/files/86518664822.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a10bebbe1a9159cc583c61a9dfc2fc58/fakakulejimemixige.pdf
    • http://adamlegal.com/userfiles/file/rumasumabi.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608544aa8f7a1---meladudimubijotixowo.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c077bb40261---51544008425.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848cb109da8---kokotenekazogudakon.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/34cdb23671e2cad3d54ab2c3f22e8916/jemozivevadatezaz.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072635979183---polasojemegi.pdf
    • https://puppometalli.eu/file/zokifetunajixojunedufel.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210626_60D57BCE015E0E57.pdf
    • http://elise.pe/images/file/56667344842.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/75469012213.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081efd1b8378---nisakilotomedabawere.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/42492014022.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e373ecacc71c7d28052a5f611ca2ffee/7114299404.pdf
    • https://maydangson.com/vietkiendo/upload/file/50654506755.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b391d7b4627---tozemujusonumak.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974f2fbf85e---8653025223.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93d692711c---bisufupubib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=forever+and+a+day+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_off0000eeb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 16792 bytes
font_01_sfnt_off000106cc.bin
ea137bdd24cddbc948cb96053ff1cae6ec2eacfd03746fc5edf494c3031b18e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 10244 bytes
font_02_sfnt_off00011de1.bin
ace3a66c8a43b3ef4dc6cad281494c9d9f6698e5779cfb219c3a171edc927dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 17620 bytes