Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ed4e6eb4e83445…

MALICIOUS

PDF

72.2 KB Created: 2021-09-22 23:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1f8cb2bffebde49bccffbf39837d2ec SHA-1: ea0380942ef028fc4e40ff747e9de449be276c92 SHA-256: 02ed4e6eb4e8344500b09cc228b72a14c7ae4797394fc651209c70a6ddd92fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs imply it's designed to lure users to malicious content.

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 https://oniceh.ru/uplcv?utm_term=castlevania+season+3+online PDF link annotation
    • https://albawadiroad.com/userfiles/files/83955795731.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/xifanodoz.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/94320043496.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a28ac1d0ca---82844896695.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/vuvawolokukenufufusez.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nomulemukemufu.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gedujob.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210915142701.pdfIn PDF document text
    • https://cncunse.com/d/files/relujora.pdfIn PDF document text
    • https://cargobull.cz/res/file/97714965606.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/46527160999.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/76853987270.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/90620801668.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614391c9ce907---jozifudo.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/rubutujitijexaxawodusoxa.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/34915754714.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tapupovokidas.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/15124778514.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/patusago.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bkc2cgakf72ejq46d7mh53epv0/joxutamopisagenoliwubed.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/23859374048.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562ea83a70---84717019263.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/durekikilozolezubuti.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/vaxazosaxezovipumaka.pdfIn PDF document text
    • 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_off0000b78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 16652 bytes
SHA-256: 06deb70af1292ee5930393b13546f7837107e79beedc617abbb8d1f4004d4bda
font_01_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10268 bytes
SHA-256: 8858efbf2d3e0b59b313a30b3cb07371783492d2d8257ead1dcda32139a8ae9b
font_02_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1