Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a1b3eef72c2762…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 06:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 190844a3fa19ee394bffb236d7720953 SHA-1: c7a3c8f8b690658e37df1cf1b0e47477bb01caae SHA-256: 82a1b3eef72c27621bf7857b4fa28bf468a54ff0901b0bdbb436e18576f3d78e
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/uplcv?utm_term=erythritol+good+for+you PDF link annotation
    • http://ithalattagarantibelgesi.com/resimlerfiles/33931348389.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/03152736f4828b9fd352314402a94eff/fukuvagomowo.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12422773577.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083452c00020---gazodutoxi.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/gujodijasavifezomazut.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30e9090cfd---60088824803.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/80c068959244e7104f126e6e79f8be1a/rugakesasogip.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9df499735---pafefirewovu.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/046c8188f64cf31880bef1cd6da552c6/bedanewizetuxiwemovudusi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vozexafuzidemuzadeboxadob.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e4acc9095---12090313291.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/najupilow.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6kibb7tep7pj55rgafk5h3js4v/konoxakatanijuxoka.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/g4q6ad57gjt3nvj0sq0n8ncvn4/69896484768.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dabcea8434f0789bac5d6b22efee7d8f/tixolud.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2384be30dd---76486208300.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/3455038171.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a955de921c248266c5af57c2c10b23c8/roxikiladananeralamegokuz.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/06e11d0u32j4f7mkt6q6p1rfn1/1653194545.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/92434007425.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///7735155886.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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 18152 bytes
SHA-256: f6035a72a31a75f745804e4b3ea2519845f94dfd98f07982c7cc84e4deee8d6c
font_02_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 10264 bytes
SHA-256: 0a316e5a170bb5d2190fa2680f36faa8932c3e82e6cdcbaa3c6f16bfbc67ca6b

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