Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dc8fb7253ffcd1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 07:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8eae857951e7ac3feab198f750dc4154 SHA-1: ce0209d4aa05d9949c615eade78611e67ab9bf8d SHA-256: 31dc8fb7253ffcd17b286c5eeae666a24f84854b9c3107842b05f3ed7aa9a9f5
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 disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--nmqu14inmf.com/upload/files/15650464676.pdf In PDF document text
    • https://xanbiente.de/userfiles/file/lubapobejakovupazupalebun.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jozozoja.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135091b5a30c---pigixapodutunibibipega.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/semajodapevupixovim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134196bab455---81434415537.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/legokodorovodaxusewexeg.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/jobepebavigifapasirofik.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0a694c6---gagofakegasijafolu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/vilagiwivusuxedekotajev.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/25707883618.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6ccb810d---jamurotemaza.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/majoxakix.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/tiwarobutojowe.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/44124456120.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/34151231750.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sevikiwisopagoborigika.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/40136467008.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///46621103803.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/simopokowoxe.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mutinenadili.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/ludalamo.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/88185895516.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/rezafifosagofuwovaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sister+location+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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 18532 bytes
SHA-256: 9a127c7e940973aaa5abb8b2b2dbff842d123fa5ab8d7f2e6eac518ee8bf5c15
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10524 bytes
SHA-256: 386e3ecfe92c003cc11ec003ef0e82d89990a5310a58f24a6cb5723df7dfa9c3
font_02_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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