Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d236f247e3c165…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 12:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b0d4bff30523a5592a12b9d3e9e328d SHA-1: 1202de4946a6740cf056348e66cd735ce051d831 SHA-256: 77d236f247e3c1651b545635268a6e52ca3ddcc8f4380f584cf12d219b339a47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, multiple heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, likely to lure users to phishing or malware download sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cadeco.com/testingsites/advantage_aviation/assets/media/file/24355879502.pdf In PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/29733974337.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d697172c---bobeguzawijebonur.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/27712605557.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/73713270528.pdfIn PDF document text
    • http://skncn.com/u/files/pulefixuni.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/98620522089.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/68254012298.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907094540.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2c36ac100e395c69ea0f15cdf46a09b7/19258942716.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/fovubedabuwipepaje.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/piparesetesupoguvi.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/87030124311.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/ritage.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vubafafuwudanazupeda.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/85386524039.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/49688866422.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/xazure.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138eeef1598f---84401557040.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/77327192474.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/7121992469.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/36577950901.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/tosoxubuxositiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+v+open+world+games+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_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 19404 bytes
SHA-256: 31992e76ca521b9a3f1e2febce4f98034ef4fc39d7c23dc193352060e3bd1d82
font_01_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10928 bytes
SHA-256: 76e92ebad9224a7d6b71e8fcf5ac530e4e8529c462dfff4dd97884404cb5be37