Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d838086b791b09…

MALICIOUS

PDF

86.1 KB Created: 2021-08-20 10:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad41649eb23ef2702ad7eae8630c547d SHA-1: c9e4036f93d90bbcf45bfb510dc10178872e0cef SHA-256: f3d838086b791b09e03994099cb0751aa3cde51f85ad46506a985d8d6cccfe6a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999b3964169---bexidixudenojaforeke.pdf In PDF document text
    • http://esebtekstil.com/resimler/files/juzinuwiwojarumawuwopote.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/64529732019.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/30293519101.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/73778561987.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/nozodewino.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/30306722708.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/jokexefetazawa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6804eb41b9---38612119133.pdfIn PDF document text
    • https://miet.hu/kepek/resugogu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef91e4fbeb---34347171639.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100c385eb65---20972724503.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/47554797573.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/72dc22487813138f90fc03bc5e4955f5/sowijipufe.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/ravaxajulevifesezelu.pdfIn PDF document text
    • http://donghotam.com/luutru/files/24624094662.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/81c6ed40bf1f54f0e2034e90538ae1c2/jarakatubemewamixubi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/bf9d327ceeaec221f3067972a703a9b8/5718200920.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/53353793176.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/1869843095.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1b60b17f6---fibovipuzexivamagopas.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/womemewexofopidewev.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090703b712ca---suvikalix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+an+egg+in+a+bottle+experimentPDF 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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 17584 bytes
SHA-256: f1b87feb6480cc213f5ccf28c3af943ca228a774474c266e3c6427eb3c9f5b54
font_01_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 10744 bytes
SHA-256: 4db4447699063f3e0e75fff80a2f53e75a424b5f5712660154b19cc0767a7d6c