Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ed8ff947e9178f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 11:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b450997d256dca25bab6056a9fa3782 SHA-1: 293230ba199095c3900a2e844f89a30b5017e8e1 SHA-256: a6ed8ff947e9178f8e8c009a46483d7aaf065b2cc5fb9611c6a5545c07d52258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://champagne-marc-chauvet.com/images/files/16760936420.pdf In PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/57048815779.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6c2c87f2ddced8fedcfb7dc311ff0f16/vamesenuda.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/latuwuviwupanizajur.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4b428e7a3ae831b6c8d3f02a37c58e55/56906120895.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/51875291548.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/43791218923.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/8613625156132a1860f6e6.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/parozabo.pdfIn PDF document text
    • http://airfa.it/userfiles/file/60258293725.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/64274381268.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c552661fbeb5adfd568f76aa54ca6b7f/xukotipobozuxik.pdfIn PDF document text
    • http://dnepropress.net/files/file/65018056941.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/luxuk.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • http://kisito.com/userfiles/file/zomivofuxolugusiteluxaf.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5274a846e9c93e1f85e2d4ecdc60257a/linilamenobojaf.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/67256419855.pdfIn PDF document text
    • http://15881588.com/ckupload/files/93294215644.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/15995450327.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/tinudagigevixiz.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/69976382598.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pjpteapd5p5v5p797th5np9kvd/795015509.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/leumd9v65jokogvq453kt2m8j5/27453542542.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/578133339.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rarage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=launcher+linux+androidPDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 17404 bytes
SHA-256: 2026e749a6956f7badb61a434906eeaaf558d763dd85a8d785cd9d8b4e578f93
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 10360 bytes
SHA-256: 5ba9089cd50e69825862d0d7e1b21b71611f0e36761009dc9ad728527cc4f7e0
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1