Malicious PDF — malware analysis report

Static analysis result for SHA-256 9868a9295e7d87b9…

MALICIOUS

PDF

81.3 KB Created: 2021-07-10 08:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fc764ac6a771ffb9c0942c48f05b909 SHA-1: b643684db915c5b12b2c11879f8ed5d3dc6e41f5 SHA-256: 9868a9295e7d87b9d757195e2820c882a515e84f113bbfe5283293c1c994858b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=captivated+by+you+epub+download PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a980cc31e5---xuxir.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/woligadedumejat.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13588648631.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf63f8e21fc---nevudonubarakigamejimiv.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21115452744.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/65956136853.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2001b74d42fb4cad9c3a0bf037b1179e/56118198991.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6487352835f764d3886fe0b60d2be818/3926327110.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73026054873.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/fijejedozesoba.pdfIn PDF document text
    • https://bselink.com/userfiles/file/goxepovivowowonoxa.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/01f19e726d07656ac9dcf7bc66c2a357/512760991.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb459039e2---88829844774.pdfIn PDF document text
    • https://sbufficio.it/file/68006760632.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a24be8ba55e2b51917f7272c017dce8b/xatikopuwezov.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/rudapebupofabugis.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed4d1ccb8d---90074373737.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b499cd2addc---57398522117.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/21595683393.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160976904bec81---jupejebuxaxip.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wozerizux.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abeda3907b7---16355196982.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/10387606528.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/bevatudukuxuj.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1017db26b9---70247859478.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210602000339.pdfIn 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://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_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 18172 bytes
SHA-256: 3afc7b75dbb79a9219cabee326403e5bf206fafce4a19925ee5c25503a928b55
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 10652 bytes
SHA-256: ec3b79b6e9dd030762be7e3e3cab81a20d014a0d48606e2f8512d3524688ba57
font_02_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1