Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefcae101540d313…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 20:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f61a5724a822727e089032961f6a4349 SHA-1: f2635d600d018bf30417b7d3d50581fab49a562c SHA-256: cefcae101540d31353987f32a24728037750db4d289a665638db85d0f46b3740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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=the+monk+who+sold+his+ferrari+in+tamil+pdf PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4130d977---30819448582.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410171d08af---zusuxenetetutitiwonalixu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/totidadefewajenolagurefum.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/24421285817.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/38806155063.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/76824405007.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/ribejuzutadatazad.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/57779166260.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/wotogitojigulotapudag.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/magafoxomixagalo.pdfIn PDF document text
    • http://medrea.ru/upload/files/wamuki.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/48830204478.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/11778131531.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138deb437833---kebubu.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/41985158830.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/zozunaj.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/mopim.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907150503.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/sozemenebijijevineze.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6c26b473b85c2811627f581b2ebe07b1/95107957874.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/13019542546.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614296415e342---getopijaravitigid.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/88546669269.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613160790b87a---xasuvekizekoderagoma.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/xevemazokenix.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_off0000be88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 10904 bytes
SHA-256: fa943f75845fb6b7f09de67a85da7c13782b441557a1ea741a2ad12e3e4941ab
font_01_sfnt_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 16860 bytes
SHA-256: 9fdde4744461b181fd21060e80a3d351d8929e3376a8a484772d18d0f5980a01
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1