Malicious PDF — malware analysis report

Static analysis result for SHA-256 211eaf2cb28f172c…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 11:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5a1fa05a9799f605473968c776b3bed5 SHA-1: ae91997d7ed87cfbe55e91f21a6a9cc3d0f8951b SHA-256: 211eaf2cb28f172c8ea1b00ef1c0a18b0fcf3e0b59cf5b4ae1a376f5c5351dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160847aba5ec9e---190374010.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160872c5826951---ximikajorikusinonoxa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3679aa55a9---kolodaboxibajagegoto.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/21889898211.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/99317671387.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/h7baie5gn1boh1l9uoika71fsk/15161662413.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3fd3ae8779aa4836d0bc1ce5191a86c1/xuxura.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be6a990f65---76894361798.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/2c4263916df60eb082713501700f828d/topesodofudu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076669b47d3d---panofubeloxa.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bbf74295---puloginizidaxafudugit.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kc4q1canct7ic9j8mq705n16q4/mepit.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/75mbt7riar0u3crik941i6of6f/sebepuretexobujiw.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m56gcqq1k1r6eborn0k4i6nf15/30539355250.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8303e4818---84552918206.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purerekepuxekigotimudi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1b1b3972---lonorinuki.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/41189285857.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b0fae585---vibuwasodedimowe.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/hiv46tftq9memrdgjlb04uta4t/44353797361.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23374010604.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/gudogemawodumiru.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/dozutuxulowebosuwapefolas.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b93249e85---96473943996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=theories+of+employee+commitment+pdfPDF 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_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10800 bytes
SHA-256: 6df50cf462b93b54e169201f41914f32363af6b3110aaeeaa0d8627ed7494c1f
font_01_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 17992 bytes
SHA-256: 12a391cec37dc240c18244e229de95501b0c260ca1b12e6abd27a9662dec2231
font_02_sfnt_off000148a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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