Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edc550d5f75234d…

MALICIOUS

PDF

97.9 KB Created: 2021-09-06 14:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e799de3071b4956506abaecb99e49e69 SHA-1: 69f91d78bdf2377529ea1dd02ceb5cf8490c9c2b SHA-256: 9edc550d5f75234d3f67da51b96022af3e15954cccc76b120000666056f84f30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, including those hosted on compromised CMS uploads, suggests a phishing or credential harvesting attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://elearning-chemistry.ro/userfiles/file/40254593609.pdf In PDF document text
    • http://jonellchem.com/upload/files/mabedufurumiripopo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16279694001372.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/depunatusujiwurekofak.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vhijff4cfr1g7r3cbn7cfqmav1/nugawuxiwipexekulosubuzi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4853d2ca22979c338104c316a837307e/bowujubukuv.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/tuzabalakuwelokut.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/mozilelunasa.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210805150547_0wgutg.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bf63f7d4532---64211826893.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6e815eff---8894810268.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/38660749980.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071b60f65ce6---33443386381.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cd813129a9e5ce385e7acd7f6d8b481e/46409203632.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0bn39onj81gv3bp2j0itu3fv59/simirezunazuvetanorifura.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210607_D566046F164BC16A.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/mezomoma.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37a758c25---ponisomeweboruxim.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/mibefivavafejotiwidupeloj.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/18234608190.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/34280188989.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021073117224321042.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c406ba9c6fd---dixaxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dd4b706b---22131319205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sunbeam+bread+maker+model+5841+manualPDF 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_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 20284 bytes
SHA-256: 61ec9bbd7f3b5746f740c7c67d719e81200f0c6e1a234924f835ae03c8a289f9
font_01_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 10932 bytes
SHA-256: bac7a80dba91dc0a622fd9ed2d461b0eee20b134ce3589b950db0f29682db3fa
font_02_sfnt_off00015fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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