Malicious PDF — malware analysis report

Static analysis result for SHA-256 c433536c0466dc82…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 14:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63f16985fbee56bb7a70b4805af16173 SHA-1: 67cb140a72ba9c58e85c5e9c8a1fab907de8fe3c SHA-256: c433536c0466dc82fa19fd41f3dc8bc500ab6f053feb744c63c10b740314da09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised WordPress installations. This suggests the document is likely used for SEO manipulation or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/94578d82947d992a49e1f9d7e6edd36d/31992323483.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fcf155ba7---11030574710.pdfIn PDF document text
    • https://menu2uplus.com/images/file/21984959053.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/86761152321.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/23973490921.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/009482c9e5c9660b29c0da4c3443f349/16443995875.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/78232034938.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/0so49mkp23o5ovsfjg5k49nprd/50959194936.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609db3c71e1a6---vusufoso.pdfIn PDF document text
    • http://ruresept.ru/files/file/nofekomifadoxit.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/90167302417.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/7b68eed1fd6f1a19a377d89279b937ed/97610870236.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tbd6gi1kch5sqqt7th996igsn1/61956690251.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kevalukopexiguk.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/tanadote.pdfIn PDF document text
    • http://coffee33.ru/archive/file/goxibupupiwumidupimizusen.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/feratawafomibogikav.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/xoliw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8a51d2dc8---sarofamixokufonij.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516065939557442.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/98151066184.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/bavemugivadused.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=much+aloha+meaningPDF 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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 10404 bytes
SHA-256: 72b44767cd9eac32508a92391240b1e9f2dffb76e800755089fccb038544ba1f
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 17424 bytes
SHA-256: 94362b72b55a5c4bdfdfd11754cac9e5eed0cc08051ab67bed54f3d69abd8ed2
font_02_sfnt_off000128dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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