Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56495358b490910…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 17:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b201a8f2e242d117c0c9207582e4a43 SHA-1: 3664226a61cbbda5e1a606771440cf5a9206a200 SHA-256: e56495358b490910fbb485eb3933c1f0118194c7a43e5d614f729cb6799f27a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baobiachau.com/luutru/files/46999707130.pdf In PDF document text
    • http://location-appartement-venise.com/italie_documents/files/7082634362.pdfIn PDF document text
    • https://blugarden.eu/file/24241444247.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/didimilusarazazos.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/80503751766.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/54496339050.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/92962003077.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134413cab474---21501712034.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/rekisazor.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/22359560809.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/37e7d7476a5999e136b587575b56d596/21948046195.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9ebba1c59d458ad00b44ba68855772c4/82732336866.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/29105218930.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/445247423.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/37676286732.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nujirisukeb.pdfIn PDF document text
    • https://geloracinta.com/contents/files/42233689228.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/61773426927.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9fc7af0f560bd22c76bce2605fd75e06/36765584328.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xudinufunupisazirerebukiz.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce4762aff---jegarojonox.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/51304632723.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/kekoj.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109060305326942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=respira+barbara+ann+kipfer+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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 20072 bytes
SHA-256: 2f9054e3e9768109a30e27e1e7f063328fd814fa3a33e917e27014637a9cfce6
font_01_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 10504 bytes
SHA-256: f7107b620cdedb1445cc0dbe96086b7ed80446dbd399e2f5a314e7fac678f49e
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1