Malicious PDF — malware analysis report

Static analysis result for SHA-256 4369ae87cc05d4f7…

MALICIOUS

PDF

79.4 KB Created: 2021-08-09 12:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e55c69dc3845b17107537cfe09272da7 SHA-1: bccd9715bc89a2b97d94bf13680550840b775b2d SHA-256: 4369ae87cc05d4f74f4576cd64cd4233a2d1412d79ce196e5f9c028de21467ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for malicious content or phishing pages. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/08vn7g4e3t3lnh1k900v2pr94c/44327885028.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f974d4c176---larevunobosoxedenakamopan.pdfIn PDF document text
    • https://ikima.fr/uploads/file/2188201035.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a949275ed6825f3d7cb594b128cbd08e/7809293500.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/39287540435.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/29q99ugrt6viaev661v2olgqsc/vadojedaxakuzej.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/60095254847.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1905198268---22115640759.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/kubusuti.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/kovorigugawan.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/vimepodebijidi.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/45464995802.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081135c66361---zinunenadusap.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/22hrcasdo2bsnd1pc3g8ird9an/91499981372.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bdcd0abec---tolanelixokalabaziba.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/gulatoz.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/jebakunavuka.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/taladudelubofasotevumadu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/mivevuzoxoki.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/sixififagadeduzedizelepo.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/47655997906.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/dulerugokofezogi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b2dc680d---93120091110.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d861cd99.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/44458633039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=law+of+sines+and+cosines+review+worksheet+answersPDF 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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 10728 bytes
SHA-256: 5ff93f0830d0015465dc5ad2d28fafcfbf97e07c5bbeb8608bccacca201518b2
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16772 bytes
SHA-256: 84b3da195c9d1836e268e005820dba8fc6001615602cfc2a0b4df01fab35c84e