Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed55fdfed986bc60…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 21:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c379beacfae3db73e4f2ec84e2daa54 SHA-1: 618228ab9f5a0a0f8b3f79dee5627ed781d6c137 SHA-256: ed55fdfed986bc6084cc6c127a120c850f701e967d323bf9160b9d3ff6e347e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cemeba.com/uploads/ckfinder/files/65156083181.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/td1ef35tdj2a7jieqitat97065/2414299609.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/42041848893.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/gozesigebogusekaziz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8fa0ba4e---3565504335.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/gugebaze.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/28846156990.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff6b6769e8---sometomubefigoravup.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/96757771622.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/40388605235.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/jatofik.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/37613413863.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/vomuwikurew.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/lojujaxuxoke.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/73970250196.pdfIn PDF document text
    • https://emenu.hu/editor_up/11473765402.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/wijujivivabevavixitalur.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/20896455583.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/64064614178.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/93312436365.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l5qa83jdi1o914atqbeoic5lj4/zogarutuwotusaxutavakako.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/bidusan.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/lobijebilosowuvutujimure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+langsames+ladenPDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 19072 bytes
SHA-256: 3c2febd21b5c0f1a3eb929f390ea4d8be31c4e99d34bae1f7a5e11b11ebff221
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 10476 bytes
SHA-256: e6f1ffdf0d107c568b3a3580401d71cc1f8c956373ed107d5687816cce32fa86
font_02_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1