Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c50d59cb39c8a3…

MALICIOUS

PDF

82.0 KB Created: 2021-08-07 07:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb3bb8f0631113cb5eaf620541cee95e SHA-1: b6631b6e484b3324944ee94e7f55b4ef7bbe9761 SHA-256: d0c50d59cb39c8a3657960883a1e20baac6cc9fa6fcaf47a208fc39160681766
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://balogmihaly.hu/UserFiles/file/gexexulinusezuvovezo.pdf In PDF document text
    • http://bagiez.com/userfiles/file/46103991095.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/39pmq0tbh0cjns72e4iolm1cg2/kapus.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/3301055988.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c935ebe85a7---sarogirijoxida.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/81988701132.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6mclt3tijlfogbit4ed263gi70/9061850482.pdfIn PDF document text
    • http://classtool.info/upload/files/60564787998.pdfIn PDF document text
    • http://geose.ru/userfiles/file/24718266107.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/57850350765.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/46100898540.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///20696927199.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/5132955044.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kirajiwazogarujozig.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/toniwu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098429d4756e---kefowobazogu.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/duzafa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1728ca4ef2---wepozirilibozometotaked.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/wegubowixovokij.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f198193db9---43924875697.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/92d20964c467aff0bc82f6cdd63ae779/finudarikon.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/gamatudikopofoxefarurorig.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vagetutudupifafadojukex.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/n2vsiqtg1farukc085hu4jdl77/4913076164.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/81935618347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=think+and+grow+rich+book+in+urdu+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c2e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC2E5 17352 bytes
SHA-256: 2d32ec19b1d8ca350366f281e86bdc377ab0b2f7248e53ebc3f8b7b2701e5750
font_01_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 11016 bytes
SHA-256: 2084aaf5a81687225a76e7e61db4174213b6e7c8e3f27e12d6fb997e66c25747
font_02_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16780 bytes
SHA-256: f260ef50a7cd21a5d9900c6f453dbb168ce5b297a1caa3983fd9d1314fd7df86