Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be7a6e6e20d3c95…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 15:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47d05c790fd0ef96d4aca2be39d2e20f SHA-1: c2f55c35646455a69c4bc400de67fabd1cf8658e SHA-256: 1be7a6e6e20d3c952d12ffdeb14cd82397faa868ed065fc9f80766dd9664ecba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true malicious destination by using multiple, potentially compromised, domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ratchadatitan.com/UserFiles/File/likulejat.pdf In PDF document text
    • https://gamaconsultores.cl/upload/file/zedor.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/biwomeleguziwegipelofi.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/nevode.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/susefovizujinusetu.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210913035716.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/tipigu.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/17825005810.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f690ec7c---putodefuduxurosavi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161338e34f1a33---50377523728.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161349d41df42a---vabapadijinimunu.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tukokudag.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sekejapezasosi.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/54844047666.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245f224529---mojawivo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gajajas.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/50655882265.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/14498841942.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/25805005232.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/74919563872.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/51064577908.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/19928243475.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/tufutuxetadidunetari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+world+craft+apkPDF 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_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 10400 bytes
SHA-256: 786dd5df7f95a3f9d65c725f7fce9284747a9b30d958946caf505466b047e09e
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16448 bytes
SHA-256: a167b6dea58183570b770fef901306c18e1daaf08a411d5f744910427939c787

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