Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb50f1d5d7a9808…

MALICIOUS

PDF

97.3 KB Created: 2021-09-07 16:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccf1ab1b4f7dd633a800b71a9d265a54 SHA-1: 33d958b004d7aab1201c7a60b4b80dc0908c812e SHA-256: 6cb50f1d5d7a98086124fe6a041cc6b4e0dd90b51373ee01d2c35961343e5536
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malicious content. The presence of multiple links on compromised CMS upload storage suggests an attempt to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97a96977c---jupusojemunevapazurux.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/76139088243.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7nedt0lk1l26mii6tfr21r5f13/didodi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc9f64a1f2---kujomaxe.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ff1f34f15b0c1b35a3c0770ea90a37dc/22148638805.pdfIn PDF document text
    • http://gibisch.info/files/files/retisegidonajoxowejo.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jorev.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65232963688.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/95145662375.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612d593618c9f---dapupok.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/8651819726.pdfIn PDF document text
    • https://cubic.is/userfiles/file/ruzoruwoxikuzazalikejame.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/jegemibuteno.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/basojunodekuwasiravav.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/35302866888.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/givufo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/83b9854c81f20d9133839bfaa4e8b396/50595496071.pdfIn PDF document text
    • https://theurbanthinktank.com/files/dinogozokode.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/46911932671.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020d096ddd---85498971316.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/vefabasurawamure.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f50a87c1e---dusonilo.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/5934700895.pdfIn PDF document text
    • http://packamate.com/userfiles/78788415801.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/25345142191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=codigo+civil+boliviano+pdf+gaceta+oficialPDF 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_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 20684 bytes
SHA-256: dd191890b5e1de4135e70e32d73dc7f527c13117a1fc592f9ebe419084e04a9e
font_01_sfnt_off00014656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6D 10764 bytes
SHA-256: 3e9d6a42e6afb499a5f5097e77bff5663bf1e98bae55e2f2b785bb08359895fb