Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4977040a9d8bad…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 08:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39651955acd51dc6e82d12225696cea1 SHA-1: 180ce86f86c72c409d79b4e247f45c11d00d5dd1 SHA-256: 0a4977040a9d8badb5ab727ff851b7b98a80ef59fe4df2fc716c846c97fafb55
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the compromised CMS upload links, points towards an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ristoranteibucanieri.it/userfiles/files/18761039207.pdf In PDF document text
    • http://agierresrl.it/userfiles/files/jalisaladoxilewazugi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/xorapori.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/92787962104.pdfIn PDF document text
    • https://people11people.gr/uploads/File/82111833658.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lazepajinuxabakijikumita.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/laloboripixabal.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132e454c929f---44237008408.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/60684639261.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/dojobozixokizosirofi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d1b37d17---57934377691.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/76042472090.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/batijadozijetaxemew.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/lixonanogadidesamatero.pdfIn PDF document text
    • https://lesura.net/userfiles/file/82501687447.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109011227306587.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/fexufono.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/lojalanunusudutaratukeg.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/1179940480.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/mitibelevemad.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/41332752207.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/womuforo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/otrkhm4pevkl52u5dm6uc2hor2/97800828710.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/32264437487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dynamic+warm+up+for+legsPDF 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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 11024 bytes
SHA-256: 1bbaad4d22eb65e4cf9cd4a6500b3e89a7367467344db9b90bff7feb8bcfb48c
font_02_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16052 bytes
SHA-256: 67f09a3c3c2c5a08e3e4e21feee60f1ef1d99109a0417379c9b3ffe7116dc265