Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bb207d2765b872…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 03:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 391125c2f54bcd6d175395d146e92cb8 SHA-1: 70745d8c6c1f4e173c72702923e5bc69ef0d73e1 SHA-256: 72bb207d2765b872ba18135f0c0ea67ac4be9e80f3d1608dc8ff657661bb0dbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to host and distribute malicious content. The heuristic firings indicate a link farm strategy, with URLs designed to appear as legitimate file downloads. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://vsevolozhsk.mebel18.com/uploads/files/sivilovokoralugulinir.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef407c7c81ddbf776cecef6a701207ae/duruz.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitonajigasubilimal.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/36864765429.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e2d591273388f0e6329db8fcc1c239ca/tovinakibokinevofu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613934c242aa2---melixapudu.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wibifusirenuni.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/60563857653.pdfIn PDF document text
    • http://nut-shell.net/upload/files/tawipowubiputubozoretop.pdfIn PDF document text
    • http://st03.it/userfiles/files/93576661139.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/82370616621.pdfIn PDF document text
    • http://intertribo.sk/files/wowapawuwenuj.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/katonixilelup.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/figadutikegupa.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/81749638211.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/12621721555.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/wawegadivufopurikevavozas.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/46396684940.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/liviperevuverede.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/86570838672.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59062731623.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kitejuxojuzitegu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/sewotesorogolev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=among+us+latest+update+free+downloadPDF 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_off0000b851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16924 bytes
SHA-256: f9f2673135f22fc5ca22747fbc94d1c82aa7abb4df3423360744b6bea819d69f
font_02_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 10916 bytes
SHA-256: b906d7ca3dcaf6b8daaf73d0178271b8fd16c35a9504736bac81ed11769b162a