Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54ab6b184f84131…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 20:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e994c5957a3b7cbce41e3d4726036ebc SHA-1: 0cec7ec7b8c943cfb75892c07f9ec685dd5e5211 SHA-256: e54ab6b184f841312e8ce50b3bf0c3eec9c2acd4bd5b6aeabd3abcae7009314c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://davnosti.ru/upload/33967323995.pdf In PDF document text
    • http://phantasos.org/userfiles/file/48731233303.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7530c9da01de4204fc3aab5731dde5aa/10809897773.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e871450d065---76971528641.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9ae430439c5dd89804bd773d9b91a00d/2701212685.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/02c57258ce864979393246919400cdb3/90233472512.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/kivorovigavobivuzagogipe.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/gekibogutazukux.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210716230635.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/rulas.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/24302695975.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k40uunvsqhjnfi0ljl92057o40/14344312382.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vozuponekudojom.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wemejowakedakurij.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rugopiwezabevarolufapud.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d11711023f2d59bbf025b3301bd776d5/85652873015.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/teminofuriditagox.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23ec1693a3---tekusujigotofa.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/dijimijofurafuku.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5ca1c388---xenenuv.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210701003324_o12ex9.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=echo+510evl+chainsaw+manualPDF 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_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 17972 bytes
SHA-256: 287387bee5e921c6d1000b349e2a218c6004f7c93f1464fe5219e14d79515334
font_01_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14215 10840 bytes
SHA-256: befbac40d4b1621371a637d13e7757c8363032874d60248ba24d59c913b7fb13

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