Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef53f200ee7cdfb1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 02:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd2008dcd35e2a7d09f479cd55ec3d07 SHA-1: 44d251407e1f243f06c91b56fc0611353120c163 SHA-256: ef53f200ee7cdfb19b3ca405c7f3f568699f3eb5d6404a61630d7d4f5b51f039
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many hosted on compromised websites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=manga+crash+course+fantasy+pdf PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/271d952d21d51f925ae279727964d72e/50830370.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091123044173499.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e44503f787---75415873971.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/nulik.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/94579201992.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210925040941168909sjrzn.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/55946493596.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/5802268779.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5a76c6c9df8332e0dac25ff0cee87e77/26706786284.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/79348077654.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/kezobukefolevaru.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/sozubupukakejerulazo.pdfIn PDF document text
    • http://abnicum.com/files/file/gifelizadoxivoxebi.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/52584124097.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3e88a34ceb2138938b80b05222927465/8934189571.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/2482321415.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/62844498481.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148a6a61a92b---59295727513.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/86043491917.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/gefutiwowuliluwudewazi.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/31998584200.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/87803387594.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/94729569579.pdfIn PDF document text
    • http://c-amc.com/upload/files/wufisopewakutexuxaxisida.pdfIn PDF document text
    • 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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 16380 bytes
SHA-256: 8fa83e5e2b1ab6cf3bcf44520c6e0e907a42b3795ff87cac7aba04ed75d35525
font_01_sfnt_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10968 bytes
SHA-256: 70512ba9d4c880b9d772589b5767c22301ad514e4b159169bcadeb9b6824b698
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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