Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a223119f9ae79…

MALICIOUS

PDF

91.8 KB Created: 2021-09-18 01:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: facf9c14ff73b10a00d86b7ec22e4727 SHA-1: 13e053b372de325a94f3b1fd439d41f54575eb83 SHA-256: f27a223119f9ae7925a6469e574ba55c9e077e40790ef33b290caf2f0d866b42
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://5mal4.de/moneyvidya/web/images/userfiles/file/38908985754.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zanivoteganomebi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9190164a---46392312255.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/gojazufadusasabojitome.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d7f40b50---devevijogonav.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/tagemurafofelomi.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/15241103761.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/64644752322.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/nukirupanebirar.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/18190478935.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/tubal.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/aca7b873f94ab890a4e7e32027efe779/jurogaf.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/15819820326.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/60796977543.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/pisupugeki.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/zenoko.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/gamukokarikumagaxo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d4f2e1c8---27601580152.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/muponizukilozenikixul.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/4710028786.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/11586882798.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/22520853615.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/tovexedagi.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69834789173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+game+sniper+3d+assassinPDF 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_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10876 bytes
SHA-256: 2db2a4d1710f867f208ce0257fd543b23678c556dc7bf6335e84779e3358da6f
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 18964 bytes
SHA-256: e718dce1d5c126fce1e0f1fda284dca429c1a4b40f4af5c11b490f5f71b8c123
font_02_sfnt_off000149d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1