Malicious PDF — malware analysis report

Static analysis result for SHA-256 135d2557a42b670b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 15:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 516362065ad0d6b91152d6f47abeb3d3 SHA-1: d1da2191c9f50f1d9f50fe7e06f8b57d1fbeb979 SHA-256: 135d2557a42b670b44a1f9321ed4c9e8edc8233a83fd654843f9d5a389c102be
196 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and exhibits characteristics of a browser extension installation lure. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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://chcial.ru/uplcv?utm_term=lala+ramswaroop+ramnarayan+panchang+calendar+2019+pdf PDF link annotation
    • https://banghenails.com/upload/file/46067317075.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/zikuzomakebiwisipe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1d55004c6---xoduz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160945f5f09c13---99756165725.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9563f8b91e---89671483346.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/berujiwagobuxaxevibola.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d63f5172f---debop.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/89937394768.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zesabewutifarubojuv.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/71512d8a04349c69574a20143e14ecff/zifumuromedag.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16094a06c4de22---fobigodevijuv.pdfIn PDF document text
    • http://kgmda.com/upload/files/pijidete.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/foxofakagadanarexinafedo.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10160101862.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/lujugovelijuvunexixuval.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/sazamujofuri.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fituvotokovuvibezodarobu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/19508314246.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/sirawivutawa.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/sazotadesitaveletepefi.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/81574653652.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mevusupijuj.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pigezemufibukasabaj.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/lefiwuv.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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 11496 bytes
SHA-256: 36b6fafc10f62f993e7903f76cca9041bcbc1248fb3834f49a1579970a0885aa
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 19972 bytes
SHA-256: 47f113dc7ece289a398cb0944d2507eb07d2975f28b69992dec443f383920ece

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