Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9367421cf39ce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 20:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8cdb477e35c0c5df102eb9953dd2497 SHA-1: c4f7f7f020fe83888a4540db2c49fc5f8c51aed4 SHA-256: 41d9367421cf39cecd05f35b7f4ed4e030521e2ab333e62c74ad95301607e942
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=employee+handbook+philippines+pdf PDF link annotation
    • https://kozmetikadunakeszi.hu/userfiles/file/fiwexasakikajolilapuduzeg.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/faf814de793620f0823308b62d5cdd7b/zudonoluzun.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37d6cb65c225f9e2787cafb0ed269caa/lakol.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/193330714.pdfIn PDF document text
    • https://latework.cz/soubory/tamazoj.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/90ac07d5c661d214b8f253277cfdbfae/48220571095.pdfIn PDF document text
    • http://polletnv.be/uploads/files/92594157580.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v3125htrp4v9tnb4bfmm67je0o/11250958505.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210808_B9389C51E987FC77.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/binubodowal.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7c04c1ae---weragomowiweketotu.pdfIn PDF document text
    • http://soupworld.de/upload/file/87276451909.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b748abd4---82414746269.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ae7a397b826bb8cefee1436dcbe0edf/63169607367.pdfIn PDF document text
    • http://mdtrend.hu/files/file/sivegu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/ximojinedodaxo.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/tikadiriz.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/wovobafomeruf.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/kotudo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e2b78156---9025215440.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zujiteremezowotakikezogul.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/vukapox.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gijolojosomakisudonuro.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff799a55e---59174110126.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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 17652 bytes
SHA-256: 673b32be3944402d807d8906485edced4dffa5189c9201a1f9f48db3239a69e4
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 10896 bytes
SHA-256: f1b92f3021e3e9798dcb48894fe84f3326368e0c96ec2af51bad2d9c18e4b8e7

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