Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4554e2da752b8a2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 23:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fffe6f47feb16cb076fc1ce0c70bc3fa SHA-1: 5a12a15a017bb102cd67c85b412e5426f05a74fb SHA-256: b4554e2da752b8a20012a8d7ff4cd0c7b4474e1c174d3907d086b76f15dc8223
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://uptownchantilly.com/uploads/files/segepisikasakosag.pdf In PDF document text
    • https://aradovan.com/userfiles/file/40621899858.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ug1cdotgogh33td27cmd2hifp4/38169261846.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/85600897243.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/baxap.pdfIn macro / runtime command snippet
    • https://gianlucabruno.it/dati/upload/file/11270206948.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161319fba3fa83---sasoboxijupotibewi.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kewogavijo.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/dalixud.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139108040487---51295902998.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/66334366999.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/nekinilalokujelek.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/30909876815.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/kabatozi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/81924917140.pdfIn PDF document text
    • http://3sdent.com/upload/files/86718585781.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sujujilomifabijijap.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/degew.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/59573179147.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/lavewajewezexe.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210910_7071937A35D07EBA.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tamil+mp4+mobile+movies+downloadPDF 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 10688 bytes
SHA-256: f065d106dd3da756150c4b838aa6d17b16dae87317b9744f9461def5384fe8b9
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 16608 bytes
SHA-256: 17881cbd5bc1a6ac40777defb58a01a865d8e06dec9753f0a986d7011287ca4c
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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