Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1cfe65012cca54…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 12:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edab1e79b388edc8966f47dc8db1c92a SHA-1: d9dabb8e31f84aa0a7f2bf246031f1e3aa781a69 SHA-256: ed1cfe65012cca54d70daa16b45e54ab0a2248caafa2e5e10432e0b384416dcc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

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://kesifveotesi.com/files/38351376610.pdf In PDF document text
    • http://elcampoeco.org/FCKeditor/file/38320202253.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/korutemobatanutelabav.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/9054931329.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/duzedoluzoxozonilibit.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/vorokudirufipuropefovato.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b6b2ebd1---fazegapivo.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/91210581085.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/2853673153.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/merisemavarakesur.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fbc0f628d972158da8fa6a385088d8cb/32881782449.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109151457181707.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/74558761342.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/29507254525.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/50619571504.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/85772059628.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/xuzajitadewekulokov.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/68383179776.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614af1574f649---wofexapajikobezesamik.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/wibolexuwadudum.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631602451.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/jalunofaninefutewifisevuk.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/32105017217.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/duxabidekupugewiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+put+roaming+on+androidPDF 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 10564 bytes
SHA-256: fd04e2a90554b5b55b94967fd8a66900854001be97229aafc3ff19854a2279db
font_02_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 17852 bytes
SHA-256: 37fbc69a5868c9537a1332f21cc2c2f5b8a6edfabd36176332025616ad2fe052