Malicious PDF — malware analysis report

Static analysis result for SHA-256 24338d38c331c375…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 17:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 523cf0d1277221cf65ac4631b4f7e384 SHA-1: b4625c3343e82f195aa13c4ea5455fd64c1371c3 SHA-256: 24338d38c331c3751f4f2221ea64bcb67e2c3d7f0c6f18b6b9b2e2a7e57f134f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://dichvu12h.net/userfiles/file/najuj.pdf In PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kidodedudil.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/73207324896.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/75607390759.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/8860825408.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/33181107259.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0b1c6def042df152f3f4c67e7dcc6599/28176262242.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/48716316318.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/89695815577.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/69436949105.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wodegupojitirupoka.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/c0ai5drpl3tbar8im4vojbvfrm/xajumo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/90870364989.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d479836263---bozobulawomikazul.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4a2b270e---23458342899.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2895880---bamam.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f702a6f376---13623433096.pdfIn PDF document text
    • http://kasand.com/userfiles/jifubibelidarupepasuto.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59744959060.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/43488306315.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/mirimunafowutavopolije.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/7469354609.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614209f35a51f---pajiwamesew.pdfIn PDF document text
    • https://fivetc.net/uploads/files/63305518757.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/94264295086.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/zikotuderej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=black+butler+season+2+episode+12PDF 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_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 16288 bytes
SHA-256: 66187a492c9bffdeaaad2fe164292f73f1c29fc8abc5bae05f8a89646cbb15f7
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 11064 bytes
SHA-256: 527850f288d9656ac3118175dcaa8bed50e56107ca9c15f2f6c510706c2808a3
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1