Malicious PDF — malware analysis report

Static analysis result for SHA-256 836606e15fc1a308…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 17:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 752da60250fe56a43dea631a0a1f20a3 SHA-1: 1a460250cab28bc2e8f954679a560ff6f103fc55 SHA-256: 836606e15fc1a308b74341a2eaf76c4a21a777e4db906b7a8e246ff7d48fe47c
196 Risk Score

Malware Insights

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

The PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for delivering malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://longarmquiltacademy.com/fckeditor/userfiles/file/sopari.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c04d21d3b---25351680232.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/manixar.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/2810233247.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/varomeme.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fajozidowaruzuwewuriz.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/bezutewawukid.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/10566429527.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/36113496250.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/81644380738.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/filikomati.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/pofak.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/87285010990.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798d05b65b---28267463768.pdfIn PDF document text
    • https://laser123.com/geektic/files/bipijokenugopog.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/74905393350.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vonuvoji.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/62711097296.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/37152558212.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h3ld07aoblo4liioou3c5r7s9h/67499109230.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/merevodawadokozuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+share+data+from+iphone+to+androidPDF 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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16696 bytes
SHA-256: 2b0e58e15f3306b0c51d2bad169c56172592d21d0dc93b5d3fa4d5344d1a77de
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 10792 bytes
SHA-256: 112df2aa873cf944938f8301b092efbfc60d74d6968035a4ffcdf20210abfbd4

Open this report in the interactive analyzer, or submit your own file for analysis.