Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ba9c88710051be…

MALICIOUS

PDF

79.5 KB Created: 2021-08-07 01:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9dc861bc17843c12302a5546c7b0de96 SHA-1: 94ac3040d4e7020a989d820a58b7c10dbe5ba3c9 SHA-256: c6ba9c88710051bea810a80cde870c3c2b286a52e5e0b78572b957fc15893655
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

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://queure.ru/uplcv?utm_term=ejercicios+genitivo+saj%C3%B3n+1+eso+pdf PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a51b9d89e---94277621206.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc17617da---kulupexuluridodod.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e16b5b5ff---sasozuwaferopirogolaporax.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/nopajodo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/69c8a852e2789e5eaf8d64b9ddd7ea34/jogadigevagefotowepije.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/38309989239.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/35243584324.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8977fe586b---tojivokuwo.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210718100107506.pdfIn PDF document text
    • https://fratellifurloni.it/file/fedukixod.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c7b453207008759908ef3fb1ddb24f50/nopabuxo.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061308094870554.pdfIn PDF document text
    • http://drironcat.com/images/file/13484820239.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/6369217902.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/72821570528.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c635dc615e9c39fff7535fc71cc28f68/50035806234.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b347db295---20393806558.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a94e9ceff---sojebuwisolikavo.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tuguzimeditetivusovubuv.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0559020a686c5941efc4a313a7fe0ac1/jomedanot.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/megazetiwaxogumatevib.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 11120 bytes
SHA-256: 1e9af45ac4dd430660ed27234cb0429bbf91cd837d147241faa39ae67acabfe9
font_01_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 18636 bytes
SHA-256: fc93629043176338c6087c7e702557a41f6de590af6e003ff57f960e469b3310
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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