Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ccbd01cd335cb7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 03:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8ffbf3a6cbc149f4e013dab4af1400b SHA-1: 2b27b97aa692bc188dd52710cbfbd7f8809f5859 SHA-256: 13ccbd01cd335cb78161f80b6ca90f3f35aff4c7d08999ec43fa446c54b4b3d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malicious content lure, evidenced by numerous links pointing to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=what+is+it+made+of PDF link annotation
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb463dc48---gulexuwojoxofibali.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086091429240---bubovugodudito.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/75987014321.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/gajofivigexejozu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/240bed33154efec4556ac96682f36d09/57756296771.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210617115103.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///68686645261.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0472224f---54726405600.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e6f1810d---43679393082.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/318dcae4443848c7bafae5f2c0a2b19e/xegewu.pdfIn PDF document text
    • https://maisonforville.be/documents/file/lenozidakejise.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/35739757070.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/92596480841.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/timutetabagugikukofabur.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/16537331279.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c073ebd47b6---21722226025.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/terozivedexekilifuwevu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3040eb8629---87264431204.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/sonopitilovokikizili.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/99632243405.pdfIn PDF document text
    • http://darec.sk/files/files/94974718014.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/kebezixedi.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/5622672067.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_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 10360 bytes
SHA-256: 21bfae619ac54e6881c9f65612fb6083425c0985ba77a6887cbed2c900422759
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 18076 bytes
SHA-256: 950dd6b83970f3a35ab1ba1caca927a13af14b1c1b23a4176595fbc4e7cd962d

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