Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0f462cb99a78d6…

MALICIOUS

PDF

78.3 KB Created: 2021-10-02 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f58b4bb84e277f38791a66470180f64d SHA-1: 7062305921f5902e85c3ce4628eaa9820a80a3ce SHA-256: ed0f462cb99a78d65102ca4208b71c0fd9525025e6cad41d48fc9defd710b7fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=android+republic+apk PDF link annotation
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9f7664b7baac9f73584d4399f2c9a82b/retij.pdfIn PDF document text
    • https://fptica.ru/images/file/jekata.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d19e4db96---3672070967.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ae51fa3b---jakijelakibagazegoruz.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/35237871160.pdfIn PDF document text
    • http://parateam.cz/file/movuvul.pdfIn PDF document text
    • http://adriennemason.com/assets/files/sowimibamatonokevoporarox.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/88909965372.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613880868c4f7---kafabimali.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qehbnvcr73tjhvlakevu46a3cj/faxawugadulawat.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/teluvotanumudesazu.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090508444855.pdfIn PDF document text
    • http://popeyebio.com/upload/files/95506839313.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/69302841715.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/92165517387.pdfIn PDF document text
    • http://foxadv.net/file/62993523860.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/viritariw.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/41985642654.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/darudi.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/29531513914.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6e8a2bc7---lizotepisezejonaloxibot.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/wibaxudosopaluzanot.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161332599d69dc---zasabusowebomunijizo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/45753997893.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_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 10556 bytes
SHA-256: 6a9986a1361176bd800e5985fe61917392b5123ff1e8c280c0ab12d6f55ae625
font_01_sfnt_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 20200 bytes
SHA-256: 4d6fcbf2f5e5540d7949c7fe138a545f91bde333c8b529c3db9cd44ca71547d2
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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