Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d5deafa685f6e3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 20:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 688138c34322eb01d62660a63868c609 SHA-1: 13a390e04ea56ba9d971cb4e72e60ef52f6e6c64 SHA-256: d6d5deafa685f6e369872d920abc1595051e9820fd42e9da5fb9889e6893e23d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to other malicious documents or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084d86c9e708---mezorobaxibifesibexonu.pdf In PDF document text
    • http://www.ecostroyservis.ru/File/tomaraziwavinux.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/72955787874.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/pigopojopomu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/31165644694.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607153f35f02a---givelenuvunaw.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kl2sa4nluc3n3l295k9evfrsik/38892349532.pdfIn PDF document text
    • http://yoron.net/up/files/tewajanijexegojopaloxit.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/n4m2628dui1smch4gvs9mprov0/gepowovisagapek.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d4866137f70354a824ab53e93b31f4df/16218179230.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/50b157690b7aef94a9d6c0b94087f126/31616462801.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e592b49e1e---tidafuwotavajewaxovoj.pdfIn PDF document text
    • https://doganagolosa.it/file/xelusufeguragowosaj.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/12496649695.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/63709593821.pdfIn PDF document text
    • http://gabortech.comadmin/file/27241316481.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/79620566807.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/23570130625.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/segomesufanufugivinis.pdfIn PDF document text
    • https://bamor.org/userfiles/file/bupijebufozifiliwofaniwed.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7781e3216---2610908888.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071977c700ee---49649691028.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/86804981305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ligand+binding+assay+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_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 17400 bytes
SHA-256: 5a9a59b982bd48a04bfb82549f10c99fa26fb217411b49bff20a983c5195a82d
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 10388 bytes
SHA-256: f6161bb511579ab8573492660b6aa53e330dbd583e217de0b8099bf9501565e8

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