Malicious PDF — malware analysis report

Static analysis result for SHA-256 448efef21d4f0b55…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 04:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2fea989664dbafb8b5a5d85da2f3351d SHA-1: befdf70f91e219ef8acfeffba15715d8011da721 SHA-256: 448efef21d4f0b55953e1c1ce44ea945cda3c4829561ffda939ba6f4650584f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://ks4073.com/file_media/file_image/file/bared.pdf In PDF document text
    • http://magendans.com/imagefiles/file/lidosikixuwu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608714eb74273---munaborasexifexubodimano.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d78cb5fc---95653256044.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/96495628032.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4411fbfe12---tepemusujaluketokuna.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/504be773e0a40a5ddecc84850123df8a/walotakumifamet.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/4cdoskofph2dq6glck2276ivht/kiperuxererevuw.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/kuwukovowepu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609885632fee9---kafipilekutotafatebisi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608110081e75c---75505014276.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/95544ab246e84c2dede432494b628129/81165680891.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/sed5qkbrivjforh34n44cm8ab1/duzexaruzigibebumikep.pdfIn PDF document text
    • https://dacola.com/upload/files/mimojigefukuzejepet.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/59477445521.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/78096931516.pdfIn PDF document text
    • http://a1-recruitment.fr/v2011/Files/fck_upload/file/52008513163.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/wugesafufimilerudajop.pdfIn PDF document text
    • http://apsons.eu/files/file/74691686986.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30595537e---wesiwafenu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943ff3c4db2---jeduvevarakefipepomivos.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/73398788411.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabe635dd8---vawumeravekafetezuvonez.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3854c19de---terorabewa.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xonopoxud.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/pufapuresuwetonadabepojos.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fd22c5a54430b3792bb8c016d5138168/buruxixetitudazedepur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manual+gear+in+automatic+carPDF 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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 16504 bytes
SHA-256: e1554ebbd15cd2d6555a7675fd71d1ff09e83a3ccac3acd718b4676825e836e8
font_01_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 10496 bytes
SHA-256: 1c0209bb9693cd448e4eff49c46181525c2169402e0f911e8b22f1fc58f478f0
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1