Malicious PDF — malware analysis report

Static analysis result for SHA-256 5129f4b738c44264…

MALICIOUS

PDF

68.7 KB Created: 2021-09-22 15:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b2d74eb8246096f07a51a46b441a70a SHA-1: c1a396095bb6c178b8429c76a16b1dd0bf0c192d SHA-256: 5129f4b738c44264606313aa5d994f02544b73e2279973e4ee61ab621cfe2c56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://canevastoilestjean.com/upload/editor/file/raxonawubinefup.pdf In PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/wokuvesavuremefuj.pdfIn PDF document text
    • https://casaalu.com/luutru/files/bugomevebujuvunijedebiwun.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/futepexarofokavoguze.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/65276506248.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/kaxolajimevekoxi.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/7387011028.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/95770552681.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/37281585094.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/rikabaviwesipen.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ic5qgtm8d86vkch5m7h8lbmv24/63881640022.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/9015547588.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95f79506---lusezaniga.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/73181785551.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/29085331282.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca2124dcc---42052958252.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/10175574296.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93481682312.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/norokatixemukijig.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/79452672966.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/besowiwibusefiluguzuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sylvan+barnet+a+short+guide+to+writing+about+art+pdfPDF 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_off0000aef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF9 14396 bytes
SHA-256: 5e0e0ce5d0e87a8cbaa350b95583082911c1461600206b3afb09da003f19382d
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 11360 bytes
SHA-256: e0e4d02e584d515c231abf941443967e3ad9317879ec884a136c229b27dcb91d
font_02_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1