Malicious PDF — malware analysis report

Static analysis result for SHA-256 751b2b17de55e4be…

MALICIOUS

PDF

88.6 KB Created: 2021-08-12 16:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac4de93e289ca5f2708f36228641d652 SHA-1: b2d1527d86b8da3dddb00885cf645289682b7bf4 SHA-256: 751b2b17de55e4be61dc6407a8123f38e8fc1fdba3f516f4746b092ae5c0b8bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thingsantiquesla.com/userfiles/files/37444269585.pdf In PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1e70fe5e---dozekezujunofew.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbb303cce---23600859540.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d486995703---51013021325.pdfIn PDF document text
    • https://educhina.mn/editor/files/95361014448.pdfIn PDF document text
    • http://blueyee.com/upload/file/30100558162.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/90379973655.pdfIn PDF document text
    • https://beaszemin.com/files/87161350716.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/bigunafufo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c309220b52---xapetewapizaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/podigon.pdfIn PDF document text
    • http://ktcz.eu/files/files/42624842738.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/rojeripo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711405b9414---6770887818.pdfIn PDF document text
    • https://j26clean.com/upload/files/14160587389.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/57592976559.pdfIn PDF document text
    • https://bamor.org/userfiles/file/58322268234.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/wubar.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ct63no26grpk1j70plgqmndj97/wurukopif.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5070ea1b---libixaranofe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bba9cd294---62993835894.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/15242577801.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7d4359c0---88599791868.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/vakorewujofi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/97ea8eae87fb232ae109e7ee9fac1fbe/74128041186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=windows+7+ultimate+64+bit+google+drive+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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 17788 bytes
SHA-256: e3060d3e26b5241b3ad614aac21c6fc55afb35fdda9a903e30f074e5df105cae
font_01_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 11272 bytes
SHA-256: a107525b9bcfaa94eb8b3e54087f5556e77e77f61d4275f033a265eebfdd58d5
font_02_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1