Malicious PDF — malware analysis report

Static analysis result for SHA-256 be04244f1ba4a120…

MALICIOUS

PDF

89.3 KB Created: 2021-06-25 22:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b648358a367b8d1e318d6257c091eb46 SHA-1: c55d8548ba3d19325040c1c27dc758eb1f49b81a SHA-256: be04244f1ba4a120c66eb646fb654bb1cfb9e9da2b45e18426d1830514d47094
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=what+does+character+foil+mean
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8dfc59bd2fcaac82239a29af4ed2e5d3/gukigenezilasikol.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/61929285aff47816eb18c909ef01b5ca/35297344012.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2b7ab61dcf3fd976e6fc85a69230f773/numeritigudusijakiw.pdf
    • http://schs1968.com/clients/861610/File/39674272389.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad718822294---45124005898.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5443a457---zenatawusezazutenoji.pdf
    • http://smflow.in/admin/uploads/file/4208501621.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd71b160c---vuxuporotikerevakugaxedog.pdf
    • http://good163.cn/Uploadfiles/files/75056543203.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9caaa4cf8---42239778865.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ci1tpa1nqa55rejg15ujc2cdg1/ronobowa.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7e7729f95848afeee7af7002d89ee138/1283046999.pdf
    • http://jonkmp.nl/img/cms/file/wakudaxakikebo.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/594e0be5dac6e7ffe138541792ca991b/kivifuwik.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dbcc4714---4959233609.pdf
    • http://singlesync.com/userfiles/file/dunofexosifagawinuxuwuvat.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bd43d31e3a324d4ebc908dfb22011efa/13213831705.pdf
    • http://forter.vn/hinhanh/file/39929844399.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/16bed7c3d970373125f000c934001162/34888725123.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/52026824386.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d5770f2a7---48157182598.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3653bb84---degabawalijakasiwunu.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a7c6ab4ded3f4494fe49d47e86358673/pewovodutavud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16792 bytes
font_01_sfnt_off0001104f.bin
d6337e29f7dcbd2ca38ab8948c42f2069cacfdb047ba0d57a098f5261b48f76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 18468 bytes
font_02_sfnt_off00013f70.bin
7a31312dfb166444eb462604e772daa7268fc73046065c325137732ac5740787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 10732 bytes

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