Malicious PDF — malware analysis report

Static analysis result for SHA-256 27287788b66dafe6…

MALICIOUS

PDF

78.0 KB Created: 2021-08-27 23:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b408645cb348b55bbd82d65ee9398c1 SHA-1: 98ce18ba8fd803bef3539875bf27ce2b149ba2f7 SHA-256: 27287788b66dafe6fb326616daf5e1e10d375015fde4aa7345dde6b72b936c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tour-paris-guide.com/cite_imgs/file/62406357785.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/00bd8e478ff247480190cf7ea33e328a/ralaxanabunosojamefekefov.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9ejitj3l21pcqel1fugq429c4g/zazowukizuj.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f8cd2acb---marobezevimanujazidulasaj.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/nejibigo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4654c82307---lidogup.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/xabaxetebuzodi.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/78586455438.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c1201070a991a3778ecaae30c7ef915c/babanubuku.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/gibus.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/53775147548.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/nuzik.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dac4bf5f1f3---76319396297.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160985b380ba02---jebixivegamukasovinapexa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074390bdb700---81287368485.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4859cc28b9---28158113104.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/21395275865.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/24798943161.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/79028715543.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/51599471312.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/63814205298.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/47918176438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stutter+meaning+in+malayPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A8 16392 bytes
SHA-256: 38fbcd0bba75bb0616783873a4ccbe2e652c786b7827eb1f2ea1703bb68920d1
font_01_sfnt_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 18128 bytes
SHA-256: 0bbf8316b98c4cee53c6d85845f7316971d6ae70e7b14b899cf841049fdd0879
font_03_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 10452 bytes
SHA-256: d1b7478f2a0287cf19be34f4e692a07eadb647c0bd772395350d3adc575d6dbd

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