Malicious PDF — malware analysis report

Static analysis result for SHA-256 688a749e9c2c8f08…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 09:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ab6a47d057b78d7126f65cd605c4702 SHA-1: c546aaf6d91915fa91b99ca17f3b4cb9b779a60e SHA-256: 688a749e9c2c8f08f1ad9ce4c64e7001e38ca31c6fad1b13674087e48062959c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://thegioimercedes.com/upload/files/patonelilunuxujipatuz.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/040311438581.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/debitovigiwu.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64843323505.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/93047f67052e1c5ddd27c3cd3f776c32/nulukamifo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff9675f43---81725352643.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/26b870f821fd70730eb10048eb7333fa/64996057256.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/xaxosifodolebinuradet.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/bevijufemaniti.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f7f7f121820609c1eb6918c93cdc4865/fapubel.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/malisi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/1965856816.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/jetaraze.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/wowirevugosawajabexemor.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/vekewiderevufubiluz.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jalob.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2484d684d8f7aa67d9a3b26c49f8c3a6/8992074126.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/21680059276.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/95f3d1d71bf26177ae23f581c9eae880/wakipuvajikodivonikiz.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/64916052584.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ev695vj315058jff78f1pjvu3n/wejadobir.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7lcdlbukdatigbr2pjgre4uac1/buxalojelereripowagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=information+resources+in+pharmacovigilance+pdfPDF 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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 11184 bytes
SHA-256: 284179b5e040a0e91808adf1fb059bdba7caa2ea8cb7a1a2b3c47881339a7abb
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 17588 bytes
SHA-256: 5efab744f5bb9ffba661ba4a70f2a2319834044a8fe48b1776a0b3620df544af

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