Malicious PDF — malware analysis report

Static analysis result for SHA-256 9608e371cb3a9dfa…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 23:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49767e0dcbfc1a63569e4a428051d3d8 SHA-1: 25e01289f7dd719cbf4f51f4d9321c0cc3753b50 SHA-256: 9608e371cb3a9dfa1cea43b196ce0e211c4de3f8d03b8827790e9beab3860f85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which are compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://iviltra.lt/images/files/vurivafumikijufodezafad.pdf In PDF document text
    • http://paulsaperstein.com/userfiles/files/75174163797.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160caba22e4c8d---68585568528.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a27661fa1---37429800620.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/21952894509.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/98400925104.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c08cec63b9107bad58e4a8c0abcc48c8/talutawodulojivekipik.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/52398049757.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/50739359450.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/wubanuf.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/gjpi3461ap1l50as3ibhucdtml/52414729115.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b178d899---24947524424.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/potosonela.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b812d005e262583f367e895b29b1effb/15639943698.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/130367650.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d329cbf82---xixalobepaxesepejomuzuna.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/58360ccb4c34da7bb25d29846ee8f3ce/62617549907.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/43543356035.pdfIn PDF document text
    • http://skupka54.ru/upload/m/jaxibeboraxefaboziwisow.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a8d38f6d3---worixopubemoganidof.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/roxawab.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/sijuwolezukipaxuxi.pdfIn PDF document text
    • https://aneri12.eu/res/file/lifezev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=math+book+pdf+for+competitive+examPDF 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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10960 bytes
SHA-256: c4872934bbca79fde7fdde0c106078bdbdd74ec8deb55b7fa408d5a1a0d959d1
font_02_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 15776 bytes
SHA-256: 000815c5ce8576cf1373a2eb6970a23ab99cebea5b4a7f1703612f63136074f7

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