Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a5235285f52f66…

MALICIOUS

PDF

75.0 KB Created: 2021-08-01 17:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c875bdd9edabe59d3da2d33b01bded02 SHA-1: 3632d1f4a6b3d8409a24ff358f8cb7231a2400a0 SHA-256: 19a5235285f52f66cd5e56af61e62c90946dfc673c7d4d7c97d2c92e5e05ca2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/uplcv?utm_term=canales+chilenos+en+vivo+por+internet+gratis PDF link annotation
    • http://hzdsbg.com/uploadfile/1621228052.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/51503443969.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/11509683396.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/gowigelup.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/gepolowonikomegogugu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fde6c17be---254365631.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/od6fbas5kevg38iqe24fjuj1j4/51550272400.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bokalibudaposadi.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/73980379939.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/a78ae054d16b606989107fbf3a260af0/fimemi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d81f4692a---84998954569.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2e2d670b---22117563324.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff24e3dc9c---tijaxami.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/115bb42440f71ca3852f48cda5971a6e/puxijiduwebokir.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/17959668385.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b2qiq8sn0toonejcpltlvcjmo1/98935720305.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/lukizefajuzodixuxutimuvid.pdfIn PDF document text
    • http://goldmustang.com/files/files/70217065318.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091aba0ed05e---jolozugubekidaza.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/10303106986.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/75b09ccc868c5f830be555539f554b77/jezuzipogasuzul.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/35661966585.pdfIn PDF document text
    • 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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 10748 bytes
SHA-256: 4446515a1376a6e4cd8fb9e6d2b4549b21e5882eb85cbe0a41ab282f75f4e366
font_01_sfnt_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16964 bytes
SHA-256: 37e7d918102d28702f67d47232ae7cec826a57a9fc6af4ab8a7e223c2e0743e5

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