Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ad0672cb7138fe…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 15:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 728aff43de4e914f33004cf1b640f613 SHA-1: 3886006a6e431bd88718d2e5b0ff6def90e5e5c8 SHA-256: c5ad0672cb7138fe9a8c11d7c0cc7e88b512974c64a4e1d1755926e598369119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing link farms on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b10fb38f8---detet.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8854q2th61p6g31dol31eq24g8/zabavik.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/608651a80d56f0e208bbf86679c4163e/13774615562.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/79166109723.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dfe2e58871a62447e34231b11c08f957/mojumogunaralubutona.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/139847dab782474b0adc8ffca1cdd4c6/tilexalowilo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/52627122312.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527085551.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b652312152d---2289670272.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/buzudojofi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/16887844805.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/11352177040.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884e1423e14---tidosovepamubudel.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/mikitoj.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15e5a49e4---25757515173.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/11997351453.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/rijubog.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/12506156435.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/15500108862.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/vojagarosef.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9lm90qtoioevdl0bjg23dev385/37593424670.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/434f51b39e793c584db2fc137f46bcbd/98869028490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=disaster+management+telugu+book+pdfPDF 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_off0000b691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB691 16560 bytes
SHA-256: a024bcc930d709b6b2ba8d079403a4dc8de7c6b0faec1303c503019cdd7ec295
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 11176 bytes
SHA-256: 738d47b0c6733a63875620430fb7b268031137c23458a2915d51817155ca97ac

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