Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93bb19fb11fa552…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 04:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60019837e88aff7b2a55dc56ad498f65 SHA-1: 78bea5ff829d7c28ea1c31b2955ca33325067a27 SHA-256: b93bb19fb11fa552b927c527d8d93d2cbb8a85ec455cf7743e9859e1eac9133a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://digireg.ru/upload/zevira.pdf In PDF document text
    • http://stelmart.ru/userfiles/file/rorupujedu.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/99011152657.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/duteziva.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf63e46415---68449979726.pdfIn PDF document text
    • https://cosmetic.dilen.top/upload/files/defoges.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/46721351867.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/75468663579.pdfIn PDF document text
    • http://rilta.net/userfiles/files/virawiwigofepuwulo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/65754121038.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e2913102---gekefofe.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/maxepegevavoxowiraf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614d18bd08f1a---63474600098.pdfIn PDF document text
    • http://capableapp.com/uploads/files/16754001100.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145395bcc9f9---zetovanaso.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/13462133004.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb0a05e7eb---pupaposaxenev.pdfIn PDF document text
    • http://nscenter.cn/upload/files/gubosiwavoweve.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401fe662cfe---xewoxetusirodosite.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/74927751679.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/40136963746.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/bewobeze.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/12600512270.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/92401831051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=juegos+para+epsxe+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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 10616 bytes
SHA-256: 1b43310bcc5921fe1b2ba5efc22fa6739a02485fcc84cb34775aa28a2aa3dbad
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 18160 bytes
SHA-256: 975080143d285c6f889981aada3f64e4b3a1e0c5a32d833e6fc5c0f42f4c3bd8
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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