Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5eb5009abfa002…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 05:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fecd8ef5aede8cbe8c412bc331361912 SHA-1: c74601459a6dd87b823c32f72df8d195443e5720 SHA-256: 0c5eb5009abfa0025d4f153fa2d7a4dea814aef111202d61605360f51806635e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=miguel+unamuno+niebla+pdf PDF link annotation
    • http://carnow.jp/js/upload/files/duzorovavupo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/42018994815.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c170a339a6a---85390178811.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d22c2c3a22---wevezipovemuw.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/84596820853.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/74972234905.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/koxujinazupum.pdfIn PDF document text
    • http://jarosi.hu/files/file/ronutaxiwosuzamiroravago.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/q2n59of0jnus5rd9a0e0bgdp4l/nexawumalemogumixegasaxu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/de30024251a9fcc5511281e2b115fd15/vutapaxova.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079757986545---segezolal.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/rezabufotenigi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b670049da48---kaxejutuxatikawiki.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e05358cf0---lipenuwodikuzabuwojika.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/44377581496.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/bemafobotoremonad.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87110a161---28105485638.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/29959068887.pdfIn PDF document text
    • http://katachizu.com/img/news/files/molopegonopinawotabepeso.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vuwudo.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/lasikidekovoj.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 17044 bytes
SHA-256: b16cfa3c918281a5f44ba5203382ea3ab83dc7cae329f97e5ad8a10b413a8f7c
font_01_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10708 bytes
SHA-256: d73f7a358e0dad9b7e0be844fbe6a0c65cccad1bfaf991cd0fc723d427186ea7

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