Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12fe86ca1ab9474…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 11:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad6622fe3d32a598437e3a467a1a43e4 SHA-1: 1154dc22a28c03bde5cc0d7410004c61215cb5e8 SHA-256: f12fe86ca1ab947439f06e430e12e42a3aaea11420619f6053fc3e371538be96
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=focusrite+scarlett+2i2+%282nd+generation%29+usb+audio+interface+manual PDF link annotation
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/pineke.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rekipukejemo.pdfIn PDF document text
    • https://foulardfotografando.it/file/vageted.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079216c841f3---22232957920.pdfIn PDF document text
    • http://4bx.pl/public/file/99063245364.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2054f075fe55d9a3c99369a801d83476/lutamafopojoratof.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc01eeefbd---18429834193.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/10399971101.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fesimaguvosumokepozasugi.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/badolufufuxiwujaboz.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/ropagufajetunuv.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xijinazagofafisoj.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/09afc8d97236321cdaa2faf9d8c62442/79359495980.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/80349120997.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473b26c2a0---90830351326.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/gutudured.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8fb0899ea---24140107620.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084148bb5fe4---gabilija.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160892a471acea---jebonaposasirotowit.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/mefad.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad0900d50---2387022656.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/mozilivum.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/77844262604.pdfIn PDF document text
    • 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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 11312 bytes
SHA-256: b26f7fcb5629bb1c690c91cab3af982551b0b992d5ed7efc66b8423634bac0a4
font_01_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 17152 bytes
SHA-256: a4299f7c85e9ce37446649821c8f75d8134d77d227d93489cf3f752be437fa70
font_02_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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