Malicious PDF — malware analysis report

Static analysis result for SHA-256 aced28c7097df777…

MALICIOUS

PDF

102.5 KB Created: 2021-07-05 19:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af5999f9dfcc88978e5498a994831fd4 SHA-1: e383fca9fc0b89f30b33b9b291866067ab60ee36 SHA-256: aced28c7097df77700a8c338278596c4aa8e3e6eb09620bff26094b1c1985698
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and link farm structure point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://wonikqnc.com/upload/editor/file/1624383073.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb766848d2---6423774688.pdf
    • http://eibich.de/layout/bilder/file/tenenidopo.pdf
    • http://kinel-hunter.ru/upfiles/file/sonogevizinukilidufofive.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601091008330519.pdf
    • https://securitydm.rs/slicice/file/xegixojuzuv.pdf
    • https://ckmandarin.com/uploads/48174548204.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160997ef7a2e5d---gaxanuduxuworakofinefite.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/il3bebuk3al31f4uheprsdusc3/46341090347.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/82569dbaec4eee8aeca1f7269f08abc2/wexedisudobopalakude.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/86808419548.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82821efd9---gekurodowu.pdf
    • http://daoltrading.com/userData/board/file/lepezezemeneg.pdf
    • http://royalgoodviewresort.com/Uploads/file/kabajiponumafixorulaj.pdf
    • https://diarch.in/WYSIWYGImage/file/nefudu.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a20d2e716b8fb2019a1be9f7f9315693/20860236216.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075921798624---vonimezifiba.pdf
    • https://aydin-elektrik.com/resimler/files/gibifixerux.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f80ee5942---71709163903.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/55513762099.pdf
    • http://driscollandgibson.com/images/edit_images/file/puxonuwudefawaga.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/77a71f26e18701563a43d94ba39cc163/lagofafafiwowixi.pdf
    • https://angkagenap.com/contents//files/rapesupuxi.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac9eb9ebc---10552348414.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=safe+house+of+lean+foundation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 16792 bytes
font_01_sfnt_off00014276.bin
101815bb2e5c87983fb86114204baba25a3e85e2353e7d2c5a54b6717c1699e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 18644 bytes
font_02_sfnt_off00017338.bin
03fd59703c8da4d650439d5131e8a684befbc5ca6c760784bfa05e5e28a9f0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x17338 10524 bytes