Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28d8f5bc2fe0459…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 23:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b41cdcfbab1e97e6eba6683fb7b610a SHA-1: d74bb1ab2109e7f575c5268a801152afe45ec8e6 SHA-256: c28d8f5bc2fe0459c708d4b2fa68c926ffc415e28e52ac733dd84ad63887ddd9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=dragon+ball+kai+2014+online PDF link annotation
    • http://7m-shop.com/userfiles/file/28362312280.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f205d4e43e---148787115.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h4dd3652srvuqpvsrlle4ilmeu/84665605469.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/14599272371.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/borugefabimepusufil.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/vopodugit.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tifubowurilu.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/rovijiburugomux.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wokiwegawaburefofatenuwu.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_130601.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161403461b7447---rariruwefe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zoxinodafevukug.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a51a1e175---94717222876.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/jukot.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kadesuzojuzisosikana.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/larezufisaxo.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/sovegilizase.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/29992169557.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/gaxokubiligomomeponez.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/ruvezele.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zeranaxa.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wizofopabefazegijones.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jezeturubirotubozigefaj.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/10527613984.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/45890471061.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/pibuduwabirawo.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_off0000b78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 10620 bytes
SHA-256: 87c4d27bdf8f2132b72da877048709229f2475466a0216b7706686b772cd12c3
font_01_sfnt_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 18876 bytes
SHA-256: 5be97636da41f1a996ee9edf753742c3b61eee291be75e5006c0a4c05da5d7e4
font_02_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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