Malicious PDF — malware analysis report

Static analysis result for SHA-256 226c381352f804fd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc5f46709d7ecba39769d5d9c2e38a7b SHA-1: d83c766147ced8ebdb46168224da8f8523c0f2b7 SHA-256: 226c381352f804fdaea8a31aa7f4f4fb905f2f62e8d27dc2c3b64cfeddb4d9d4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://venusnvs.com/userfiles/file/divozigo.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b7856ad7ccf7b69a5f1a091b33abb50d/28097570439.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wamukarolifunefemebiwiru.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/zapafas.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/33712a032dd90d3baeb78d20fc26fe0a/80147171196.pdfIn PDF document text
    • http://turatabor.hu/media/58707557235.pdfIn PDF document text
    • https://coffotea.com/uploads//files/202108070024422468.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/entv1e4o2fae15sipr4cc2qdg2/bexudabawebusiv.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/1141447892.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-30/20210630063343461030.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/51776722368.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/48526360870.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///62054440743.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/kugujibi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160760c277e46d---zadugigalewopezogurusovuf.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503094822969886.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/ziwaguxesoraj.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab77dcc840---lobikeveromag.pdfIn PDF document text
    • https://activepymes.com/pub/file/tivesafip.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/47889619978.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/93053950445.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/nikusumibodulezil.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611407855943a---jovavabesuxubekimuvod.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/fapanuxasetesifipuv.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/rogar.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0a67a487---taliwatogidutanuxajerivu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ajb7v9f2a24h00qtt6qdcrkn7f/72427213112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mapas+mundi+para+imprimir+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10356 bytes
SHA-256: 52e2d8371241aad30ad42510a34704a826075818581963a4909d70b9056196d3
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 19828 bytes
SHA-256: c5d3faff789b95c16b7fc109e0db8ed0b27e78d1f1988612249746520d5759e3
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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