Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed31297cf2841f2…

MALICIOUS

PDF

108.1 KB Created: 2021-08-28 16:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c1e3de014b3b646ac2834f739c92388 SHA-1: d0986c28286fc72c4bd066ad9652d544d0c2a90d SHA-256: fed31297cf2841f2b5780001f19c320ee5f53e4ac255273301d310d1bf2de02f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://ceccarbotosani.ro/userfiles/file/99949282409.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7285a7f3cb---20297830903.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/sobeliresufub.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/nenavavilaroxasukazur.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/043006aac59f73f988bde084335b69e4/gitazutawelejowi.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/38725969462.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/50614477028.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/73313893473.pdfIn PDF document text
    • https://btegypt.com/file/vataxuwolimorazaloxiboda.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/ranajupekilexomove.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cab2a14ada06ad89a4b5e90c63777b18/53173609548.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/pimozulevuzerusupesem.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/52295651842.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/bobuniraxuniwuk.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161274c373fcce---wiwofe.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088079f1c734---dubetoko.pdfIn PDF document text
    • http://beiks.info/public/file/zoturemuzawixuga.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hj1a56b03l9pqkkqjisoaimljq/78015261537.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/6077181673.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624636374_7f633beaa2.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ab5c4b7f6b5f637e0734d628569056fe/44646798326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=items+that+begin+with+oPDF 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_off00014518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14518 10584 bytes
SHA-256: 8beb016adf59b2f1f5d87934fc393b6d526411f2e45bff0ef6630033fdb4c0f5
font_01_sfnt_off00015d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001753e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753E 17536 bytes
SHA-256: 56c32e002d9bca4b3fb4edfec4ab408e5aedeb64d7aa3b2f085d36936da9d179

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