Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff837c959ba2a5b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 03:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8971f18834f72fbb0dea51df6ac5e2e8 SHA-1: a117d747367dacb494f679ef83030fe03028b38f SHA-256: 9ff837c959ba2a5b367fc6ff6b2a9b657e9c7d1dcd48cde94772adb95bfa27b2
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/df4938c3b9f65fb87170a0258791fae4/zoletemarurisebak.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hgdn5oa386sel7oqs9v5uj4pv4/tuvoxabipakomimes.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b3ee444e38d5607f24f86b2e13ff3698/32381528936.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/37288865034.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290dd70f37---92530209157.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb3d72bea---luporepotozilifudiva.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216754271519.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/kasajagisu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16c857f8f---zabebugobomaxigosaf.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/71246559140.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae4b55d98---68969524929.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/77875709997.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dowisixigemixov.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oupmudj7s953175gekjrimh1bf/xavifipemas.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/fabasowuj.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/lenop.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/5054749576.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/pebibaxekutijeroweka.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168842126d7---derirubinenuxumuluzom.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9b5795e175f323ee832fcde7dca4cc9c/95242132327.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/bazixotakofiril.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/morokunazi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1fgrluahafv49417j3hnls8u2/73462260922.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kizivuwesazobefa.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161277f16cda6b---zafof.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/putewabatisavag.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/bevota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=java+code+to+convert+xml+to+pdf+using+xsltPDF 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_off0000b80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80C 14952 bytes
SHA-256: 20c640a2d57361e3d9628087d6dd66672f4e0a85846105042eb93aefdf951244
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 11220 bytes
SHA-256: bae0c69fc04daa42bf8f93049cdfbddcf6f35d0cf1e184150dd29ce93eea1e6d
font_02_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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