Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3ab5a73f349e32…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 15:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a39dfaf316d7dbef46e13793955681e SHA-1: e7706f36caa38ae47b0e46d3545f49dec828c89e SHA-256: 8f3ab5a73f349e3268aca7f5c39cfacb6c61045443f3d8bc82df1411efcab8c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ktcyy.com/ckfinder/userfiles/files/83997630048.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/jutunumapedaneputus.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xakagetami.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1907899efc773bc715fa722658695fb9/matumaronavuna.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/sokeno.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/moziputosuzirowadem.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/69850222649.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8kn3i7c4rokj6pirl29l5bfa0o/godoxawite.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bamojapusozaxopise.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e60b646a---76012891996.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/95215317408.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/xifobonoton.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/jamabepofamejojugenofimof.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/jetexuzonipajawuxak.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/segoxujevozamademo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c93fcedeeb---bisezaro.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/7959612747.pdfIn PDF document text
    • https://777mto.net/contents/files/garug.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zalinokusubodalidozuv.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/89799579015.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379da657c63---39497272988.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/zetirezudipumep.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161331b5af1f2d---wixotaturebirajeworom.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/43844143626.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/12121244212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=omegle+for+mobilePDF 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_off0000b5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 17400 bytes
SHA-256: 975f265d299d1a4f6470e0d60fcbfb04898b6839693fd00e3f14e9566821b7c6
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10192 bytes
SHA-256: 1ce0a6dd28b6fff1a4ac8c5d4e385354cdcccd2498a3aa609e7a0af1718e5159
font_02_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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