Malicious PDF — malware analysis report

Static analysis result for SHA-256 d308432ddcd13c15…

MALICIOUS

PDF

67.3 KB Created: 2021-06-10 10:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 77ad5dea34a1e7f18de564073b847481 SHA-1: 58e1c9fa549d59809a37fe4cc47a6f4ec7a751f7 SHA-256: d308432ddcd13c1550ffa1d8aa93e675bc416d93d71c842ffefd9b792252958d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=write+the+word+sentence+as+an+inequality+calculator PDF link annotation
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b186539c3---gibudepevedafafirexazazu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/v9fjv0pj3kt59q0ecpu76j28i3/62166481854.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/9997900762.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/regurewomoweto.pdfIn PDF document text
    • http://adveotec.com/img/file/4746681353.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/488bc1357395bbf9f968642e375147ff/lubosuxasemanexigagaxut.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/58975577592.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/15415867296.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfddaceda3---36072015767.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf49cee09---47121361778.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81ee77982---59689517589.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/62cad084764389a44b1adbeb1dd197e7/77138570548.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822b18df40---kubozutawexejirebikum.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/907c8e719e4473505f61e55baa175a03/lupijilow.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/negozotifuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5360 bytes
SHA-256: 601fcfc53ec9cf57a30be4b82e2e320ff579feaad1801bda66e072b2d243d5fe
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10428 bytes
SHA-256: fc2147d9cdd517a365ce5dbeff1ddcd1f3c8769e4d53f36e40da8d563383adfc

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