Malicious PDF — malware analysis report

Static analysis result for SHA-256 d246c41af133c2e4…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 22:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6e888dae648bd3854a5f218720a769f7 SHA-1: 3812e2e63c5efcc529c1198760d7a4d985467c16 SHA-256: d246c41af133c2e4f290c5d3efda79107b81d631273bcb5ace6505a234fe382d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/053f66823c41334cd404fa45a049ec56/32494625918.pdf In PDF document text
    • http://lamorenj.com/userfiles/file/40514990903.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/lerimijupive.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/57723805749.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/06503e3950d3e78ced7cc99c1b2a5c03/73741277788.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/wepozaf.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/12806231465.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f4dkl7r2kbva7unipbq8uutfu3/rasemerag.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5f84f4f33fae13483fa5cf1c723d8d7/tubesi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071960669c57---gibomitarobaron.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/45898532846.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/18027921243.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/89116376646.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/79343860188.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/60626756120.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/54189562200.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e74fe7aa0---34970156988.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c5925856---vafodonerupilezelip.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/matidumikoxideloxuxabof.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/57955433197.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d40a79291530b5f6a721c2c1f5dde6d5/nikekutedugizusobabudemo.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/81506878176.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210705131536.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nr9p64uahjdebu0dmmpn8tvs2p/84409689872.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/jilolemow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sims+4+download+apk+windowsPDF 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_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 18236 bytes
SHA-256: d758c0edae9fe7e529b0858c0123e3de49b2786a939c70d75fc1825e19a518cd
font_02_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 10552 bytes
SHA-256: c7511fe8d23a7ae2fd7af24422210ae57c9913ddbb20d5999049ad4b7205ea8d