Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7f8e5cb565e188…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 18:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 302577423c2a7b523435f208f3234779 SHA-1: 5408f65072ae9f75bd7733e3368811ce161f7d60 SHA-256: 3b7f8e5cb565e1889319d4604462550feab43d2efb11736cf5505450c175b709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pekingtogo.com/uploads/files/94949550386.pdf In PDF document text
    • http://airconbank.com/upload/fckeditor/file/5196874477.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c4dc8cd5e79bbf706b782dbeba506900/20617609302.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/fagabenukenab.pdfIn PDF document text
    • http://devison-matras.com/upload/file/sosimuleweponasakaruxudoz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91bfe45bb2---pixafodagolemumerev.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/wovosolixujo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b07db72e8abdd64bf1651969cb8a74e2/43549199063.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/10481522742.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/vufubozawati.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0bcbb164d---77975417082.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/79501030218.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e25ca74af87e644037d8213a29c2e73e/28913399088.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/b76l4tvh0shqb9dtqsf3g839mg/takufojevapazeke.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/80867035683.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/20987551721.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/22893248486.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-16/20210816073923376120.pdfIn PDF document text
    • http://sport-way.ru/img/file/31824176232.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/feliwalosukorojozuf.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wegavibadosevakexugalir.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/85911178033.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/76677727786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=piano+sheet+music+for+beginners+popular+songs+pdfPDF 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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 18680 bytes
SHA-256: 527acaeebec7647b70227dbf58c50c89425ade9db603d4eb2c3052223b561468
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 11308 bytes
SHA-256: ef99ce7a3319e4e9eb45e2df5ae6c1b9d9ff6308075613ef4cd1dabefa6bc840

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