Malicious PDF — malware analysis report

Static analysis result for SHA-256 457d5c1f3c5db239…

MALICIOUS

PDF

98.0 KB Created: 2021-09-21 23:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5318794b94f7d920d84f7c4809d62aa SHA-1: 3283125065bbe24d94fde1bdf08942a18c95f9e3 SHA-256: 457d5c1f3c5db2392735b62d3d43749bbdea981f2f2efb8492661dafca67e2e3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://hdg-gmuend.de/userfiles/files/13546829603.pdf In PDF document text
    • https://newtop-eg.com/userfiles/file/rusifijukogowutenajarod.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e721bf6a.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/17393646437.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e7df279f9eb2a249ae7ec3ee687202ed/kikupubefufeso.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/66639145280.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/virim.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/89105111152.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/9726977789.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109130919122908.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/jefatibosisujew.pdfIn PDF document text
    • https://msiutilities.net/documents/sawotexotid.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3vdg9hap8eu44phsp3d8dho61h/70666154432.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/62573887343.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3gdqgpno36vc638878ikdo8ll5/13860626658.pdfIn PDF document text
    • http://c-amc.com/upload/files/negefejijesinemojizobu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gexenegelezanesi.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/kakuxav.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/17538480472.pdfIn PDF document text
    • http://fabtur.ru/upload/files/muganew.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/rulexalarobebudarolowado.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/55719137359.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/12095c62f6ba2aa6a1b040e722e602ef/xoxagazov.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/3729206910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aldous+huxley+a+brave+new+world+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_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 10996 bytes
SHA-256: 542b4d2e2902cc13dd3e9bf704dc3fe064113b6c55c44402f6e171ba18e1bce8
font_01_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 19284 bytes
SHA-256: e29153bb26063887812ff8b585023226f5c770b0a9c88c3fee6191357c2c65ea
font_02_sfnt_off00016274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.