Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba7dace4f6b11ae…

MALICIOUS

PDF

71.7 KB Created: 2021-09-30 15:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5346a0dbe6cda01f2f250589473fc3c SHA-1: 7b43d70ccf6cbedc10c2c0015bb7c37ad501afac SHA-256: 8ba7dace4f6b11aebe9675d22a41d4ec3874d148303ead29c46d4c97066a9189
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=business+card+maker+pro+apk+free+download PDF link annotation
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/rogukosideponuk.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/73b65bc120b4fc23ddce150be3e11192/94175296231.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/94507746378.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/sevogilokurarozi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2gr1rr2rkq6l2jbmfibgmbrmct/43194479665.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/77560295377.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/tajijovakegixad.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/xipakuteraxujenebuvab.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/2564201781.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/7803976753.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/21cd059e292f09701639f69b7c2bdfd1/70880602940.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/30197141836.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/maforedifijo.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/12142634033.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/zavezubawod.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/43179965997.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/fofuwenuzazo.pdfIn PDF document text
    • http://citty.org/images/uploads/file/61594745506.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/gidirovimafi.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/96004422698.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18598718863.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382b6fe1500---wabusij.pdfPDF link annotation
    • https://sonntag-immobilien.lu/userfiles/files/67411799389.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/30899003644.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/feraposunomuxi.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/93352943803.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/rokufoxuzumuzupo.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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 15504 bytes
SHA-256: cc92918a91defdb0622c25886dafff5d710ddecc5c60f4ba09b99dd4639e1638
font_01_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 11012 bytes
SHA-256: 62ca580b33cbc65e9b80f46f908ae9669e6018ac339b33dd53e86c74a4b34d9b
font_02_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1