Malicious PDF — malware analysis report

Static analysis result for SHA-256 247a62c84c7a7f7a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 13:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bb04b224419f1d4af2e3b589907135f SHA-1: eda3252325a80ae41dc3ccc9b3018c2752e4f277 SHA-256: 247a62c84c7a7f7a60e5f0098696b5cced5c880c12ff357bf85f1b97530b804f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b55bca73665895015488623ef969ed76/gikajulavivo.pdf In PDF document text
    • http://dobrasekacka.cz/userfiles/file/66861798440.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/robijonizupodadej.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/r8a7ed6fq0qpnrru1lsmtf0gtg/70067156165.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8ip2n2ql35ut7noijc30iatvh7/49055765314.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/87833445185.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/18802541182.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bevej.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/16889059895.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429065633936786.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161185557341ad---4627912509.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4eabc3176c---8895114170.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/tovitidifos.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/73862770667.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/zelanabuvapadisapajuk.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/76ab0846e62b061016f8b6da9a5bd15a/85077317186.pdfIn PDF document text
    • http://texmet.pl/userimages/file/78262021595.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/16272692181.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f5463635d38dc7575efaa8331408d582/84432408899.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/70511167383.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/59077190878.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/18818690686.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/sakapirabariwebamaruzone.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/nofikonesupaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stratton+oakmont+sales+manualPDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18772 bytes
SHA-256: cf15861ea018b43d17263e9a62842582567234ce34e8f3c62f53293b065bf186
font_02_sfnt_off0001269d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 10444 bytes
SHA-256: 881e0898c6058bcf3397086b3dcd32d23515cb24ed904a16a83e337f2aa2a86a