Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c8f4a7d26a8d07…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 02:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d51c809a79958bb347301bf0bc8199d SHA-1: cd687a4c329db71a684d62cd9795872b8205c320 SHA-256: 30c8f4a7d26a8d072d371c48ec30f18f402015a391b2c3b204ac4a3e2be48fa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress sites. One of the primary URLs, http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e0de36ce---sijelodeseluxugoleviras.pdf, is hosted on a compromised upload directory, suggesting an attempt to distribute further malicious files or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e0de36ce---sijelodeseluxugoleviras.pdf In PDF document text
    • https://vegan-eshop.cz/data/file/24383107467.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba989e84c7---sumejugiv.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ff9efd58088f88d30edf0eaa3ceb03cf/54498977606.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/46161042749.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/20682290949.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/fozipolirovirunelabezafon.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/kajokedadaraleli.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vikuvodixujunawilipaxemo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/51de80cca25b266797d7b9979ae86c08/64525118539.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b86eb7e25---83915460440.pdfIn PDF document text
    • http://industra.sk/userfiles/file/varotaluzebuba.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/87654778582.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/babodoxikakikoseva.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ruvidb5vg7pl56qm6faun2gd7m/makudefuwawa.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/66226093729.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/49774874347.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1611a7fac5---sutufefuvopinomas.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/relafebuwugi.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/11971941448.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/zojiruxesisuf.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/lugesidinedajozozigaj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9746a0783e---rudekuvevotabepilanam.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/40c937b49e06be7980e5e3efb6583187/79440426908.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/xovubedizuje.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wiletibajekufex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=action+verbs+worksheet+first+gradePDF 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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 17632 bytes
SHA-256: 1ebc1bcc3ed3fe9caeda6e9ff68168faf715ee94872104a65a4b94bb2dd2456a
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 11076 bytes
SHA-256: 2cec9f4707891b7de64d31d81665458c1e6ee884a4708c67879f7dc2195a5e2c

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