Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8951c8f19846b1c…

MALICIOUS

PDF

88.5 KB Created: 2021-06-12 18:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e08f88d55474701ec30c248ff8a5712f SHA-1: d83b35a4cbdfc67020e7739c5b61b195e60fdc34 SHA-256: c8951c8f19846b1c982a403320dbad83a5c66a46a8569fd7de1503c9992aa4db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. These links are likely intended to redirect users to phishing pages or download further malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=ekadantaya+vakratundaya+dheemahi PDF link annotation
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/40a972a00fbb275371529d3b69f69418/nogusixunaluwokilipo.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/suzeregor.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/kejamuvimiwinokeramilo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a8f65602648b29e4909eea082ec256d2/8728055912.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9b08921a4d993083696d0dadef92a400/ziludezidagedaru.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdbc70082---demew.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/45558349414.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608008c0576db---47816586888.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a060b3259---gazetotasomojud.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b485dda0c7f---luvikesatidu.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/73792249704.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ee5e10d7---38887652816.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/995e730f5d50dc6ac25b0cac3dc563e7/gavozewix.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/37e6eabb85ce351ca3a1556a43ef3c36/99762172846.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8b4b2f06f838063b0e0fce71eda0f2e6/xozugarakonovuru.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/wuverutugutupumaxosutem.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/04f8q51glr0kv50vgpsfeumeek/91471429853.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fcf4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFCF4 24612 bytes
SHA-256: ca5c76c21a92f0c197fdcb429e170af4124702157a0d6e42403fb9d1e3b3c717
font_00_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5040 bytes
SHA-256: 71d8d1a809fe2492b126f69e8a00b161261c3f6e6386a7087c754a22872137bc
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 11192 bytes
SHA-256: 172b9a1f2e948a719c655eecb4bb703dd5f49086f8a225477eb7f97aae820e96

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