Malicious PDF — malware analysis report

Static analysis result for SHA-256 36789e4e254b00ac…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 23:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 164602aee1a06590669609a90b6a3897 SHA-1: 064995e55ef930d454878bdee80d09a7e226b83a SHA-256: 36789e4e254b00ac236c7c54fcb699fd6816fca2490b646a48b9d9189ebe9e46
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a redirection mechanism to deliver malicious content or phishing pages to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889415c47cf---guputadiwabakevekovunaror.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/364aba27e404d7053a06aca84d40fa02/62318544060.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/3396245684.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/35703015294.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/72856371919.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/motosujiki.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/2dc4dbe5ddf0f856bccc67202b89ab49/vujorumutifebuzoxubuxizuw.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/dajibumedexukumokajizut.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d78dc217d189f62a49b3ce8d02da098e/tijidirarefopunedi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9d6615f5b40cebcf86b18d6edca51be8/ziposegolaxadubixija.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d03ac703---58638465949.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f306e84552---tejinibubunifa.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/raxujizile.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/wibitexagogogus.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c3bda6f26f5f0d3978d5ad9b6a771c9b/81800812315.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/garuwamagozedi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///29555340989.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f0d0630a---bepobolok.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1e9ad17f---fepiw.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76426bf12---woxudavudonaredide.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/adddec89e55e0c463019f0f816cbaf7c/vapadogijojezituke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=flatworm+in+stoolPDF 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

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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10200 bytes
SHA-256: 139e8dee61746c2cd85dc515dc78cff46bc715680a0da45447be8e461c175526
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 16348 bytes
SHA-256: fa6270bccce0130d10de2d2f3637800e859ae8cecbc301464b0a44fcfe9db7c4

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