Malicious PDF — malware analysis report

Static analysis result for SHA-256 533fa64d199e8fec…

MALICIOUS

PDF

100.6 KB Created: 2021-08-30 17:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e9a118e832e286eaf422430f96c0ace SHA-1: 351b9aeabd7ab5c72965461ac08c9f6a546fcd0e SHA-256: 533fa64d199e8fecb02e4894e92044f9432ab5525e9e6b43a9ab0d603dc83d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b89809f2---4746639193.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc9615060---jotupikovefakumizan.pdfIn PDF document text
    • http://willbramephotography.com/44396836056.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/jutasijifivot.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/64111277139.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974a81690f---luvetipadigilorotapefake.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/watowosawodapi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64432380f1---pivonow.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/kupijiluzasedija.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210622_2EE4D4EDB2448D68.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5e51ff9a2db5a96f89acbd5c795ca1aa/segururipafuvudofifawabek.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/25633493689.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7d12934c5b0a559db5aa84ca55a86427/80247983258.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd7d61113---82668520111.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/puai43emorvdr41tdvipvl7fpm/nufavotufalobowomodedekag.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5paoqsr8jk41pjr677h7p4smu5/wumatujonituzalidizudire.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/33055395693.pdfIn PDF document text
    • http://emeat.ru/var/files/voroxi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ecccc3fc---75192408298.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/61301214704.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/neneguwi.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625186982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=offensive+words+starting+with+ePDF 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_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 17476 bytes
SHA-256: 5d9ddb2dc86ca40b3058e15121db9765d8d6914520aedff5a38d8fea97d82cc6
font_01_sfnt_off000152a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A0 10764 bytes
SHA-256: 25e5894df98e33f2df33fc251d58f3d311f1cb49e9c61e9d2a0780cd76f2daf2
font_02_sfnt_off00016b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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