Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b89b67ab6d29ee…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 06:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5541177a05997dc4826020402ea5dac3 SHA-1: 427314ca2349dec7687790e9b943effcde8956c4 SHA-256: b7b89b67ab6d29ee633deef34ff602c390a829aaa33a27ef8f25655d7ac91ada
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous PDF links and the use of compromised CMS uploads are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ipekyolumedya.com/resim_galeri/file/bugiguvulajidederupogizu.pdf In PDF document text
    • http://youzedu.com/ckimages/files/20210911100735721249.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165592b4b9---9670554755.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/latemorajibedovepav.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/tujafepesafodopi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/36423164277.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/32969068956.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cee1c2fc15---giduxilukamawovatuwiki.pdfIn PDF document text
    • https://webhosting4.net/media/file/45652842148.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/58784017038.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/224049338.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412fc3c6f3e---21523421465.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/19347507921.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/pasupafutitawonafokix.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/5648195159.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/danagodunozosu.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/34918396390.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/woloxetupogiwebonor.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fupaxej.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/guxovewogomozesekuvo.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/68812114879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=epic+games+fortnite+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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 17728 bytes
SHA-256: 607f3c9c8a83ad23ec4892f6094ebe2d6b4db7747c6c487bc6da02369f9a8198
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 10900 bytes
SHA-256: 80f10c0bf693e687b2dfc0b244a66b3335759388abbd5cd05680fa7ae0093b02