Malicious PDF — malware analysis report

Static analysis result for SHA-256 1119cefb682d0f52…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 21:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9c684a13284853846c50b6db6453192 SHA-1: 4fd3e7f1f980c25a1f4b8c4eb1ccdaf4b25e9277 SHA-256: 1119cefb682d0f527b26a7751b6d5ab7874ef6da591f3408dc76c3aed8bf1ca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=how+to+use+downloaded+fonts+android PDF link annotation
    • https://fultoys.com/userfiles/ferapuzezi.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/kosimuku.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/14592331426.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/35180882733.pdfIn PDF document text
    • https://agrando.cz/files/file/rogomobanupilozepebip.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/8653902065.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kegoseborajifi.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/23419592014.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143d0063bf3d---zaxivavuladasatepi.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39937518201.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gijaxobifas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e50506d0f---lukizema.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/jajakix.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131581c7144d---99467783442.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixugalupaji.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210906065537.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/sufufovedube.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/65888303252.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/36658519054.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/nixibinaruwidi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b24dd6c1fc2ba0eaf114469daea9feca/49088867447.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/gidoturudizoxemiwi.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/vivukovesarifizi.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/pijavi.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/sezazuzenodaruv.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/s8i38nd4nbkandloprj9n4t102/rafokarojafebe.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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 14280 bytes
SHA-256: 961382ebd3ae8d42099d97ff209bab23c6c3366e0acadb8b20c3163f1a3690b8
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 10524 bytes
SHA-256: fbde5b94da9d76a67dc810be9500091b6f92bfefb6572bd3535bae6587b78550

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