Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2037808ba2f696…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 11:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8a7c4218bc3b97e51a7061f3cc6642f SHA-1: 824b422a6dbe9cac591da5f811c16eb44ed0b639 SHA-256: 2d2037808ba2f696364727ad83ec73920d9aee0cb04243eb841abf0312853b8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://anabakorea.jp/userfiles/file/20731094600.pdf In PDF document text
    • http://mawaevents.com/uploads/file/82697798055.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614349edc18cb---kaxobedafofilolafaloluzo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/zewidivowu.pdfIn PDF document text
    • https://norservis.cz/files/files/gotekefop.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/dexovozopirakabomemepux.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/jinanuzajivo.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/guboxibi.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/44500460279.pdfIn PDF document text
    • https://projetovm.com/uploads/files/51636537083.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/34085333582.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/wurudoxulo.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/92412410619.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece0a7046b---34488408464.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/gufigunugeritusoseru.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210916173717193.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/gekax.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/29335916373.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xagifurefifadewulako.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/satubozajagipuxajajoduv.pdfIn PDF document text
    • http://wych123.com/upload/files/44295660660.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/bepupadexunav.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/95385365492.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9cb10c772ae9c643645b9b24a1151b/xafikokoregemuwekegep.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109020608135613.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nepagarilewarebugigazonen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=types+of+pyramids+3d+shapesPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 17244 bytes
SHA-256: a7e2c4985a440a632b3f25c13e74d0211dc8759fc824216c0ded13b04ddbcd7d
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 10764 bytes
SHA-256: b6f45b1aea114304345018f29d264bb66de626872f36b4ed2fe5e8c0e9613f38
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1