Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e97418a3c41bac…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 14:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46561cf8cbecd9318d8a8738385b5026 SHA-1: 0cddee6b4fad761c468c1c4b6662d4e3344c98b8 SHA-256: d5e97418a3c41bac36f42607c15ed8f36fb99cea7fcd5c61b8fcbd5d886c7052
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of these link farms and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xycrusher.com/d/files/gedawivozupobuwokokes.pdf In PDF document text
    • http://fluitec.fr/ressource/site-image/files/93883745002.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/99010961778.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d455c8ed---38840993197.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/51460028227.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/kefakupokijibawisezi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lbrljren9v2ljm6ch5n14gda80/dimazuj.pdfIn PDF document text
    • http://heureka-cz.eu/files/vigexogobofetuwugife.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090918441856427.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/7fdeecd8234105836313c25b1d5cdc4f.pdfIn PDF document text
    • https://sealskinz.ru/files/file/44446129715.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/79988103375.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985d3cc83f---41903011904.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/pusamo.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/47833691414.pdfIn PDF document text
    • http://boldogelet.hu/media/ravofag.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/37887565652.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jopafewin.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48445022407.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090519043610981.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/vodoxonizikux.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/12489863877.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/wanomerog.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/doxateximizafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pixel+experience+note+5+proPDF 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 17924 bytes
SHA-256: 0ff3959ab714bf7f0c76828720928125a539364efa2128202e073a892afb0601
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 10276 bytes
SHA-256: 07e1c02d0163a0dd9644f58011c10ceff5545d9d795686174acfacc039b5b1c0
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1