Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be50259e4de900…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 22:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 128f2f69a68f35c94998c21827a61f50 SHA-1: 8d0a57c5553e3d843d87dc5ed24f6950f8fa1731 SHA-256: 87be50259e4de900cd9c070c5aa08a34da588768246fb0102bacbcd574022686
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous links to compromised WordPress uploads and SEO-optimized disposable domains reinforces the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://masukpt1.com/contents//files/zobonadudolokodori.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b173da185d---88283425764.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/25155870016.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/10554986080.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df94925d754---kasodamodisaxusijavekodof.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/rulixores.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wenizerazapojumenum.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4af788988---xizujizenebobadejovalose.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/butosudadija.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/nupululawelarusovomilow.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/zogup.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/julexinazokazusoxobutej.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/79267392786.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/suredome.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/92621647997.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tkrnrguhp5cqdrkial9ipuambi/midawonasijenijigufexab.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/cs1pc9ien7rlm5lpageiorhdej/ruvotak.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec892bf95---legawete.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/rubelovufagubibogiguze.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01042d20f---bibasazewuv.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/nafesebokomus.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c751942c---16825567061.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/80651192674.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed07739524da2e1fa5d76abcd03a175d/meruvetewadipuzive.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210823233122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=create+list+of+worksheet+names+in+excelPDF 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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10912 bytes
SHA-256: 838daad8a39321ef76e449ad7064136f22da4c9072d6ea1eda8de87aea48d84c
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 17884 bytes
SHA-256: 4c27f8d688d2c88c92dc146ef7c74bea0f727b9d0b968917df830965ca6b184f

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