Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee2ae59e70a24a0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 17:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6771b15b93a02d91175647e4711dd829 SHA-1: b293ebaac09af0baa90166274ac672e9507f8686 SHA-256: eee2ae59e70a24a02d8600a188a3b0e52e83d5768348088f3e8fe8aa3cf5df4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links to PDF files on compromised CMS uploads points towards a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9d50f9c4f0365b84a6085644811b8851/89345617269.pdf In PDF document text
    • http://ukonlinedirect.com/userfiles/files/bozamipagovoliroxotevuti.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/gojuninekol.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/ligorogu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f621269e7f---79398256360.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4697b939a7a5716fb0261617ca0a8db7/fosabegowadunemek.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zipatowevabefanitavidiz.pdfIn PDF document text
    • https://hiroyoung.com/data/files/xasijipa.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/pexulebiku.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zibiwokedalekonavu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/kukisutevavakojanodigisij.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142627622d44---27359878950.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/fesumuxixafi.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/fepilodal.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sofabuvogoniluzidi.pdfIn PDF document text
    • http://z500.si/files/sekuvodo.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/2000202840.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/lilowak.pdfIn PDF document text
    • http://besteva.com/upload/files/bozawumurejokidi.pdfIn PDF document text
    • http://davcpundri.com/css/file/vubizazobopiwafes.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/xonukunutabiroged.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/nadajanitaxa.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/tuvomoxijonesuzibiniweve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=age+of+empires+castle+siege+download+for+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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 18804 bytes
SHA-256: cad193661d2fbff0a14979c946ecd0c361d62d495738934f82311f4d2e4f91c6
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 11028 bytes
SHA-256: d13af9015a6b9b9b1284782ef885a7efade579229f75267f86ab4922dea6f776