Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff0518f9088f876…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 05:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9b008fad494165f9cd7aeec1595e01e SHA-1: 574f9456e87c45024d41bfbdedb94806ac1b1587 SHA-256: 3ff0518f9088f8763f61ff7c1b0c6fabe2be203c139d244b65c49e42534538d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document's structure and URL patterns are consistent with SEO poisoning or link farm techniques to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db79a2520---sedepukigoruniva.pdf
    • https://shidoremicrosys.com/media/15141144446.pdf
    • http://contrast.no/ckfinder/userfiles/files/88068528202.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/85863502890.pdf
    • http://dycelife.com/userfiles/file/kozawebotemaki.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d64be7d6---17437225430.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e20a3ee4---92640295128.pdf
    • http://zhfangyuan.com/uploadfiles/files/pagolejifegixatiti.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/zukolon.pdf
    • http://amghanoi.com/images/ckeditor/files/pibedolitonutu.pdf
    • http://evevoyance.fr/adh/.-/file/36428370790.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821884a1ba---79615676789.pdf
    • http://cuacuonanbinh.com/userfiles/file/dagurosuw.pdf
    • https://sysyanginguvenlik.com/uploads/files/zaxukudew.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210909_CD7AC0FB975E2BE8.pdf
    • http://hidrometa.com/images_upload/files/nubepagewigupuxapigubem.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/88896569851.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8475aea2a71f8479f6c5bf0e5ed726a8/riledaf.pdf
    • http://futboltotal.net/images/files/25825556808.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fibovasewekoratepuvevum.pdf
    • https://pet-fashion.ro/mm/file/japeporedopimago.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/mepidadoj.pdf
    • http://musicpark-live.com/userfiles/file/78507567264.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=firestick+4k+audio+delay
    • 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_off0000d45d.bin
33a230c3aa35b08def6c4a63256bb763808ece10e61a005fc179a33676566c29
pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 10620 bytes
font_01_sfnt_off0000ecda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
font_02_sfnt_off000104ec.bin
4bd377cc73a79c80a9edda75def08fa8d794869f903797e1b41d730cadeae328
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 18144 bytes