Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f6f632c4accc87…

MALICIOUS

PDF

143.1 KB Created: 2021-09-03 07:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95877b0baaca2e6c04067b449b2a45f1 SHA-1: 3d45bbb88527685c974cdeefc84f392c9b6f06aa SHA-256: e9f6f632c4accc87e2749b215327df7612ada3e29567867b3d65fa304fb9eb8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=alter+ego+a1+hachette+cahier+d%27exercices+hachette+pdf PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5d2c990c---2584877566.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/89599867018.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/20172868762.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cbaaea2489013d09a175a33fa80db45f/loxejekimojituzopigula.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d108b962d520b4cb51efd15496dd4d38/45867779375.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4292784cafb61ff3447521bc80f1f727/80863258180.pdfIn PDF document text
    • http://mastervin.ru/files/file/zamugojasolomalago.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1edbbbf884---dukil.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/92364322591.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/66755365986.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210625191955_2087157679.pdfIn PDF document text
    • http://vejwun.cz/images/gawugokanenivap.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/15735765368.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/44939478481.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/puthun42lgbmqsf59ad8jrluf1/diwegatatowibabujuxavode.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d91c480c---86386274509.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/50547446559.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/25268652821.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d016e396ae2---38677907560.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/gajepunejebowituda.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0cb30af2431411f4a68ad51eabac8ec5/pepiratupelilinuke.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0ee547d21---73223035555.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/97898835873.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/xugafatujogijubudej.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/83fc9338b9cec26a5dad780289d103bf/rebowepekumaxokubanekan.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_off0001beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEEE 10964 bytes
SHA-256: a2f262fb85aba87f13bcd636ffe17f4d8a59e76f9a2803bbae2a908c1973e2f6
font_01_sfnt_off0001d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D86E 24300 bytes
SHA-256: e100034893b679c583309ce34838b0f248da3fccd36fe45dc87436e4df37c496
font_02_sfnt_off00021547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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