Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e945eb04722e172…

MALICIOUS

PDF

93.2 KB Created: 2021-09-23 00:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a95f9f7783194115c308315b8e2936c SHA-1: 17cf3c81cc58e4cb0f4ff3a392da1c2a27d71b2c SHA-256: 1e945eb04722e172bae2f96c5933d7315e5a2d5eb706e1cdf5af8e366c390798
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple URLs, many hosted on potentially compromised or disposable domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://tieulongcopro.com/luutru/files/19923997365.pdf In PDF document text
    • https://dichocungtoi.com/userfiles/file/9983762414.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33530cab8---72422163541.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/60436712053.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jowuzotigosupolonuwojop.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef04c7f51---semezano.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210919142123.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/51315339927.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/numosudugusajikuzolemi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/153f5h7kulh2iennet3u7huhn7/31530994601.pdfIn PDF document text
    • http://sb-78.ru/files/file/turopumadamar.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/74110636502.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/42900437180.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/gagezidiwido.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210912071901.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/28209443764.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/73ecd19ba4bfa846fd3cb4a856c021ae/muwinenukisemi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614820e871172---vowuliwomowabi.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/gijetu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210916113522.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/kokurom.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/tonoluzosaxusifa.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/tapazanokum.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210918_1188F42D92CB3D3B.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/39161720241.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/tabogox.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tljvcb4tfbrbml8e8bfnt3rsn7/96052318496.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614093351ef2a---duretidowibof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+movies+in+movierulzPDF 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_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 10296 bytes
SHA-256: 868afb48c88e71945ba51c10dd05a1948c9e5fc5171fe4b0ffac5a5e189ea129
font_01_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 17228 bytes
SHA-256: 0ba62bc24f2939fefa8cde7e8428019756af2a993c1d35f8db1ab22f44978287

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