Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee23e9842187c5fb…

MALICIOUS

PDF

84.7 KB Created: 2021-08-05 14:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af92ad0991982c29988bacc2fa6c4d84 SHA-1: 8ab9a02a99a0c960dc281036d893e13dbeb9fcca SHA-256: ee23e9842187c5fba95d4cfcbc92de82f9528e4d79fe5dd83cf81941d5ae4c30
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=libro+econom%C3%ADa+1+bachillerato+sm+savia+pdf PDF link annotation
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a14bedc74---33898861102.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zefegabusu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80448b9b7e---29664128312.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c52bcc0ef---32085546775.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/898l2bpdo2hpeltks80u9ol5j7/14859000856.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/996db212f6a34baca19d27c9d01344f2/jetijikuvagalefor.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/89376818947.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074686683d30---mujade.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/3140665059.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/xuduvenugidigisatut.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c496d61e648---pesukiroberibugejedinete.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fbfa3e2fb21b8edc8491c8a71975c7ed/misamosikezobuta.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ab93987---41563054865.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb52e5f9a0---gipafesuxabufunukan.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609182f80ffc8---lonekozitili.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210715_152152.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/kodepagajulaxojefosamida.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160792c17ed8e0---44443011210.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c41e24cb9ecf01b6d0b72aac00bc1633/82623729957.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080af8108674---firidexa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da22fea1e7---25342753220.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kag2kjke6gtk8alt2qv33q12d3/25452364449.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 17832 bytes
SHA-256: 707b27beef884715cc5944436c8bacab8d800e850815df1fb2f5303699f2df0e
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 11164 bytes
SHA-256: 47abdc4e9ea634277a8d530e3f81d7a384ac9f646a4530b8dc001607e397d922

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