Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b8f2cbe7cd1236…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 19:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d76a00ba702f526eba06691a503156e0 SHA-1: 293726367b8f49f83259c51a4a5671a49e0cd24b SHA-256: f7b8f2cbe7cd1236bb7661ee24c4fc18779b7cf76f8805c864aff1ec2c2a7caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to potentially malicious content on compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://creteotels.gr/FCKeditor/userimages/file/nafagifevameteji.pdf In PDF document text
    • http://hrzservices.com/uploadfiles/file/wexokorebavatune.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5b1164e2---niwozenoworekirupasa.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51672946743.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/66843813908.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zomekajimowas.pdfIn PDF document text
    • http://ledson.ru/upload_picture/31532881266.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b3321a05a2a6341fdff1cd587726cc23/96956485315.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/pulusizatonadoxowam.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/wepatobopekidubulizosu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/23325374441.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d086903ed---bivuzuz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/57ee346dc365781d0b0e8e209bc42f13/jexawimeruketigirusa.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/30620c197f32d60ab1e1be8dbabe930e/3649612713.pdfIn PDF document text
    • https://wsbtitan.com/images/file/ginemavupiwuzunidobiwizev.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jotoruzoximijugo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/9295187401.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/wanewupalejotuli.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7cbb6c244c401aca2e2cb8e089dc007f/foxatusukiwuda.pdfIn PDF document text
    • http://momsystem.ru/public/file/tumudiv.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vewukenanesum.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5b7bf28c---matowuvijoroj.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160767bc5351b1---48400469076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=site+of+light+dependent+reactionsPDF 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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 16572 bytes
SHA-256: cbc86ed37e42fbdb3aeaca454feb3ba3244c93a13bebc722541bbbbabbf38002
font_01_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 10976 bytes
SHA-256: 39a896c12c38164d9af09622419f91bc65f2eb45538171959af1efd069770e39
font_02_sfnt_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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