Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5d52e550576590…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 12:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 211aae27346113dc92df1137ab34c716 SHA-1: 547959af98af35d84ed4007f903c0ba5a0b384e5 SHA-256: bd5d52e550576590d3364b22d3ada49d0ab190221734b24aaef9f5fb3f6ff1a0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs, including one on a compromised WordPress site, supports the attack pattern of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://dawnraytech.985.tw/data/file/userfiles/files/zuvuvoxesezesofupanaful.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/267657262b9ba82e4d3f85df3e01f7b9/13066776046.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/85025302039.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/miludelodeduk.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/19476329326.pdfIn PDF document text
    • http://cwesp.biz/upload/file/melat.pdfIn PDF document text
    • http://selidbe-beograd.info/files/19997964556.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa84182f6---wogotor.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210918092209.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/72141531816.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/vutokamuwukuman.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/jewulujeru.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/60749477082.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/mulujiredu.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/87320736763.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b37183366---7591400983.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ac04652956960df1808194e84822c7cf/61750571256.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/64963248628.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/56589754807.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/vepimudig.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16151e78dad867---857618232.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516becb7f13---tipomide.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/rapazegatabosukibowajel.pdfIn PDF document text
    • http://rilta.net/userfiles/files/90053739932.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/leminexefagafujofeverumu.pdfIn PDF document text
    • https://ayurmitra.com/files/file/56095042830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+harry+potter+and+the+goblet+of+firePDF 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 14676 bytes
SHA-256: 5df7dfb8cf0575c07f862647b3e4440a7059a92c66f7a30ddf50308a65e352ee
font_02_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 10948 bytes
SHA-256: 1f66ed35320a4293ad811d1194ff562aee10423812916ed41f6f597c8da0ed5a

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