Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c58dabc3b93bdf8…

MALICIOUS

PDF

97.2 KB Created: 2021-09-10 18:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 773d372c90beade508452c18ea46b678 SHA-1: c93844f74f377daef25a95e8271680936a9805e2 SHA-256: 2c58dabc3b93bdf820ef6926729d0f20dd0d08f44a1bc2667d8a4abc2baddac3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://epponline.com/mentorfinancial/page_images/file/wutegorejogowizexuze.pdf In PDF document text
    • http://messtores.ca/fck_user_files/file/1126865418.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/851137986612e987aefaec.pdfIn PDF document text
    • http://stringladies.cz/userfiles/lijivogizakozumisefuwut.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/65243984995.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613717db1b9ab---giwizimes.pdfIn PDF document text
    • http://ave-france.com/pics/files/guvodowowaxos.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d59bb5126918959e548b3e4b9487bbde/59228382209.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/kojujejuzakozaputazogugex.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/xirujimu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/21031522342.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/gikekuvugijosudonosimumu.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/3140351689.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/bomebodupasebojigevidi.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/73404850906.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1064cefe6---293811550.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/nuzanujudujo.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/3940916445.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/72257750733.pdfIn PDF document text
    • https://atiksigorta.com/files/juxidorasedekoxorinag.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/88287969896.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/serowemasiripok.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/64234725515.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/xonul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+state+of+play+online+freePDF 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_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 20600 bytes
SHA-256: 6447987f029ec171ba60aa7c1a6169ee3f99c41310c8bcfea6d10e7652b564f4
font_01_sfnt_off0001469a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469A 10684 bytes
SHA-256: af297334fd843852566f47259af33e547574c4fb3865c7d94baa13e1b735e24c
font_02_sfnt_off00015f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1