Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882e9b051bfc929…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 21:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e42211dc8ea1bf053bda105b3c83ddf SHA-1: c2454526f5803fde3412f7934661b68f4482a2d7 SHA-256: c882e9b051bfc929d8ab9ac258f9afc768b31e7c9d03a805f9a844732ae96383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of a link farm on compromised infrastructure is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6ff83fb6---baxavexulojadem.pdf
    • http://c-amc.com/upload/files/xavewulexun.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/16ve0ir8f459ogfgdhq8bdcbk2/jaxojazetaxutolod.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v7fqtclqi5ct8836vnhqj6ipei/wizefuxepas.pdf
    • http://afghansolar.com/userfiles/file/nulerugo.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b987edbfe4f---11333630907.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb2712459---lelupukot.pdf
    • https://abeess.com/userfiles/file/46950122452.pdf
    • https://aedwea.com/upload/foto/vedopibemilamuj.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17439a609---wedifiwabulegilug.pdf
    • https://pet-fashion.ro/mm/file/54030399017.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/01b993b75f95b1792e1d7a8d2ff7605b/58414914116.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/313b74cd03c99c99973c87f42a9935e1/jazovenamosisibenitof.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff497dfa52---54561011928.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/dfaa06d796b9c66938f143970caeb27b/xemubuwugerugawalaxirix.pdf
    • http://netmutum.com/userfiles/file/jaxemuzu.pdf
    • https://nguyenthelong.net/userfiles/files/manewujibinalepen.pdf
    • http://peaceinsrilanka.lk/userfiles/file/mofofikadivaxaka.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b7e9d7ce---doribasejosur.pdf
    • http://szwygs.com/upload/tikazuveto.pdf
    • https://apsco.ly/userfiles/files/nusokezesewataxovikab.pdf
    • https://nasselgrundet.se/anvandarbilder/156/files/xijadajuguno.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609aadbc89feb---pejomowudipikomosukinor.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4e38cfaa9e3d2b10a6389751bf8920a9/74128933094.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=word+search+puzzle+247
    • 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_off0000eb97.bin
e76b09d1a1e55c58c7abb40aa272bf71e2f99c7b05478f56e7c19c601b73f75b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16352 bytes
font_01_sfnt_off00011614.bin
d37451ab71f8ce4126bcbda12791e132d800c2f0b1dc63f82641604d40817620
pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 10720 bytes
font_02_sfnt_off00012f0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes