Malicious PDF — malware analysis report

Static analysis result for SHA-256 8544f449ef359476…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 17:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0da714e4dd4b869f007e983fc724968 SHA-1: c0f3399147c3684c9feebb043e8d59ba7095eb3f SHA-256: 8544f449ef35947603136363b0f84f80264d14ee235d41cf6f4b9fe0dae4612f
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a link farm on disposable hosting and the compromised CMS upload link heuristic suggest this PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156bd5161f1c---zowemujewerapuxarozumuf.pdf In PDF document text
    • https://marathonroller.com/userfiles/files/libirilaxavameb.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/41044372505.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/90f81afe8bdeca97ff64718c23eefd43/79296511497.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/5139977051.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/boruf.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nofugivapapazuvo.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/24594534488.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/borulefetali.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/4023505201.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/zababenalesupoxamotorofu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/pabejalepof.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/simovekodufufotaxokajuzon.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/74474193965.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/55583754893.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/falepiv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3fb7eb279c964c004be11e7690d3e07d/zozob.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/biwoporuxesu.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/35100581573.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/wefoxix.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3813b5c3ea4e391c5880c971044c7ba2/susajirate.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mo4e7sbj45m1n944f0p7gc4to3/bagupekab.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/ledizedo.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/17875622455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=400+czk+in+eurPDF 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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 9984 bytes
SHA-256: 13ed326c2d18e305b92f003aae037813c9fa9c6f0bddd58b755959916836ee69
font_01_sfnt_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 16708 bytes
SHA-256: ff150fa1b261318a8463842b18a9843f8f550166d52e5d002f138e4f1972093f
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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