Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaf64ea6c9ced78…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 09:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5200dcda28b638b2e75561a29979b98 SHA-1: 41a6bfbcd15af22496e20920f95c82fc91c482ba SHA-256: acaf64ea6c9ced7884cf840212a04717a1fbd6e4ba03cacb3b845a1a9939d5c1
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous links to potentially compromised or disposable hosting sites, coupled with the lure, points towards a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://perfecthospitals.org/ckfinder/userfiles/files/30661089351.pdf In PDF document text
    • http://anm-av.de/uploads/files/zaraguvusorefepifoko.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kerisi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o7q9fei0e4eveajifcppqgmuhb/gikadijefaju.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/dofujizotetusote.pdfIn PDF document text
    • http://monyetjoget.com/contents/files/42490997368.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908194700.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-5/20210905170501985996.pdfIn PDF document text
    • http://uchid.com/uploads/file/85169422979.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/61683413963.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/70222301759.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/26628693754.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d428f00a9---fimumuzafivadagukemu.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sukixovukasu.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/bajejozakup.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wuxajesotujejenomonod.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/u0ep74hbi7904claaih6nbr5u2/42972982139.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jofubozasog.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ccde225d5fc5fdc1dde74bc592353c08/2962165647.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lofotikajeputavadafamuto.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d490bdf3be---pufuxakilodazusulugugiv.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad9407906---12985385099.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/noriresufa.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/41816414431.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/80228421452.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/madeduzunebemurowesekizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=zoom+out+chrome+androidPDF 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_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 10484 bytes
SHA-256: 499689230b1a0ca9aa9f837e5c079e98ed34eb94ccb24ac811c4d3ea592f99ee
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 17960 bytes
SHA-256: 4db99e62a9919df9285fa22482b374712917e46ee81cf27e03e1e6fdbb944b75

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