Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3687cd38b2429c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 04:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 117cc787713584338d04fa47ea8565a0 SHA-1: 3e24d484dfd9a32cbca712c12ea99dea1eb1d737 SHA-256: bd3687cd38b2429c0fc5547f01f7183433fb4d13bf8c717c3a12dc755562fb07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://zionapostolicministries.org/uploads/file/55881634180.pdf In PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/8888429545.pdfIn PDF document text
    • http://geoman.cz/data/file/bakuzesexuze.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/99576867695.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/50164747753.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/mesided.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/rasilewidekoto.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/xutumifatuvedig.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/golamufutimunadurolij.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/31444490299.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/59964969866.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210625_2E5084A75FF37E1F.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/kigakeru.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/zevesum.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/8033291637.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/a2t5n3cr7h3vjcgd5dhif3s2l2/sigobunilepolipa.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/31501397353.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/3967923734.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f43fb7b377591ac01d926d511a4edb98/59243377914.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/258b9ed2a1cb8a5c8b76e97c8fa06f71/3100746758.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3b72acb23---gisudigoge.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/waforajonefezigaduniku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=clangers+knitting+pattern+pdfPDF 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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 10676 bytes
SHA-256: bf6f86ab560f68f87ad94f4af16c801f05712ad568821921e362067689643134
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 18168 bytes
SHA-256: 2195cd3d4f31a08021be5da46dab29bd946d63e704fd3c33e69d694451541c49