Malicious PDF — malware analysis report

Static analysis result for SHA-256 1824ca5eb2fc5141…

MALICIOUS

PDF

78.5 KB Created: 2021-10-06 18:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a0d1fbd418518c197f9052b82e18b30 SHA-1: 34605a274231e015c715fff6c576181966755355 SHA-256: 1824ca5eb2fc5141e332876aa530db2af10f18d3304dd0483bfdb93f510d8b7f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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://smidgel.ru/uplcv?utm_term=parotid+gland+swelling+one+side PDF link annotation
    • http://angerdress.store/ckfinder/userfiles/files/52232034217.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/9203760330.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/97206555600.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/25637653990.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/30554413904.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/vesitiwogosiwu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/54553455652.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f83f814298f88d968b47d95fe4ce70d4/wewebanofikarobujudeveli.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/wufedubedemaduno.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/defewubuxegosivek.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/45585666485.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/pofuluzodabotal.pdfIn PDF document text
    • http://mfahk.com/upload/files/52083557087.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/merovitifomo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jubugijatidarason.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bruut6mfho77qiohc12ki7r025/84940583393.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/63970907414.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/62754722733.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/240626028.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/85172372880.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/imo9efg1cggf9b3mm9763edbpg/bavun.pdfIn PDF document text
    • http://alltechsro.cz/files/luzuvofasupu.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/petasexuravajumuwip.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_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 18564 bytes
SHA-256: e8738c74cadf8aa897888e61763493e52621bf79b2e769b65733ab4ee6857f17
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10508 bytes
SHA-256: 6784a610d075e7172e8421cdfb7d0f270f163c97c9975b0da31c7e074c309f41