Malicious PDF — malware analysis report

Static analysis result for SHA-256 f902c8cc9fcd3a77…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 10:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 030c64b6164e39ca91b9986216fad7dc SHA-1: 3cda4f82ce6276e3e715e823726373447b6f42b9 SHA-256: f902c8cc9fcd3a77fb0a5a0dac633feb00040c19417a113ec09f8e4e9685e03a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://premiersuli.hu/files/files/fuzodalenozofatiwexos.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8298d4562---79394977059.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/29305069464.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqvb2i5krrqvl13csofdhb4r47/9211569782.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021070523383573499.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/75705819619.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/89547452197.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c72b27f2---nawerumutawajerekotog.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tuworapuburifo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480957df79---voloxujizesediwidaxexu.pdfPDF link annotation
    • https://heks-tech.com/app/webroot/userfiles/files/30484333617.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0mi01pg5an8u5s1la748vdoj22/rebul.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/23185240291.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/81454318675.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/83c83b685ebb437e565533c1fd502c56/84569953660.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobuw.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d30935858eda9a72fdff03b64812aa16/namejubuvodi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6d24719bc---pegefakisixofivu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667ed0baee---59366724027.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202108141535194220.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6570f25af60f35de1e1aa0d62eea9f4a/zafas.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/48519501405.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/ratarizubirogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=warfarin+toxicity+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 18240 bytes
SHA-256: 2b95b95822d06ec9cd8e23ee60c656188ac2f7abcb2115348acb916f6cd40a0a
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1