Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef7aa190eee4e1a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 06:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c671973f3dee4d8c697940744b1c1d6a SHA-1: 79450c8f3249a703bd2a685d5f93f26a814d2c6a SHA-256: 3ef7aa190eee4e1a206831b52fbc3ea22f6a470d1796dd3adb8c399e864ac8c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable hosting, indicating it functions as a link farm. This is a common technique for distributing malware or conducting phishing attacks. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ville-dammarie.com/ckfinder/userfiles/files/66000919670.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/6105473158.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kipufileripakopipisese.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5311e1c4b5---84851339926.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/kixot.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/47316335501.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4f283e7c86769468d14b912dcdd46ae4/94788760352.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc5440be6---tipodaxukisewaxawular.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pepopelofetomegak.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/11678194646.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a05194c2e91---wepoxapawigozuzojesojub.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772763f080c---zisadokozobuvalusopeb.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/jasupolowefilewupusikipes.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j258uv9k22kc3gs0odq6c4p2pq/rosoxonigunamozo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa8341cdf---nurupibowo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fasofepebedupij.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2616fba7cab759549eddca8f2f2332f3/detebujananukanobu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088560570e13---faxakomiguvutapik.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/63e2236a1eadcd5d93c352b3527e8e8b/31091917683.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/dinitofuzuw.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7anr4on56m92j4hc9mvpoq7si9/41278202217.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/67773908197.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/96899713892.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/gevotojumasuwimewaxatod.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/pafarutixovozi.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/18586073107.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c588c09776c---mijekinugunevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=little+girl+from+toy+story+4PDF link annotation
    • 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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 18676 bytes
SHA-256: 624f7f7e5785447ac1f6f4d9bcc80cddde3168309765a5077d8ae45a30186fc0
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 10440 bytes
SHA-256: df61ecebc13377a2f4dc5490200ec183955a5b16ad64b55a992342badfee8211