Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffe487ba98793c8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 06:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b18c83113c831de5cbb9181af50448e6 SHA-1: 839188e1d3a489fae1b3ed775735c6f1a474985f SHA-256: dffe487ba98793c8320aa0c62211e795b991e63f64d593377e3ce8ddec4b64a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fa61dbf42---35737163089.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a1e5ec4c36e39530112882fbd2f5bd8a/mebubimegumukokujode.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4bb87f7b---83408373272.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/75171907291.pdfIn PDF document text
    • https://advik.net/userfiles/file/92387650934.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/ruvokotobufoj.pdfIn PDF document text
    • https://loctra.net/userfiles/file/ludiwusagixixexita.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/nomebozodumutexegazidalu.pdfIn PDF document text
    • https://mmszke.hu/files/file/fesimasix.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/trq7bl4jnqhp0htd4vovcq2hc5/nemexetuxudadamakanavupi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b76cb04e---76988625412.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/55165249315.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9cca9355e---61158603285.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dde40cf6b4f2122a1f8248b2eaaa8469/megodijebaw.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/zinotoxoxizazesekegadun.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a6d4c04588c297dfc200b73c6e46f42e/zupegegosesifusirujibul.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tqrucru77nuavfv78plm09t8j3/kibivewanemovefimevijo.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/futabobuvi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16090f855e134b---linemutiwaxajuxinunogiroz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ec7e9bb8opng41hsb81riot6o5/zutirusixalagezozosixizas.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vanabora.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/joredebimi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125300642948---39499963695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=monthly+home+budget+worksheet+for+excelPDF 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_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 11296 bytes
SHA-256: 2a6d509c2d18708def9cbe46e51c8806804842c82a89cb4d33bf5804debef260
font_01_sfnt_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 15972 bytes
SHA-256: e25e4ba31abb78535b3f4e273164692be903b20540603988ee216795deffd192

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