Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ae3ee1e14bd6a5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 18:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6cd93316ad01e2356f3a57d223d49c8 SHA-1: 29582125f1e664ada0a6188eb4ec584716db3ca7 SHA-256: 59ae3ee1e14bd6a54d9154b449c310d30e64cda82eb64b78290ea2011ee4c423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The presence of link farms on potentially compromised CMS uploads suggests an attempt to obscure the final malicious destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59eaa465f---90935976660.pdf In PDF document text
    • http://altiro.nl/home/tjerk/file/noxamojekibosawenaza.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/pejeridibejudir.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lijido.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/40857375381.pdfIn PDF document text
    • http://www.dafnimimarlik.com/ckfinder/userfiles/files/96496824938.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1525f7fd---zigeb.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rq9sqrpggre2f38noidqn8o092/49306015139.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e95400c0f---pirazezuxazefowefabe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2cb8889f9---jenesozoseluwerunopa.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fitajazifojaganelutugivol.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/65775458645.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/7291173342.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/94647267983.pdfIn PDF document text
    • http://4bx.pl/public/file/medawetosoxoz.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531ae2955---45567964878.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/nupuzowavuvigivotowanil.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b4b5201441c62a407d402402c9ea4be7/motapilagalurewopatezebe.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/24670722970.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/xogugakidepobulubibemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wonders+reading+writing+workshop+grade+6+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/72159355246.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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 11068 bytes
SHA-256: faa19b0c883b4341fac0c19740b56142da131e002a088dd3a3a0c6e75bebbde7
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 17024 bytes
SHA-256: 77f80be9c1881bd0fbe9f4bcc61d53f2fcf856fdc6c24a27b01e56339c4a6dec

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