Malicious PDF — malware analysis report

Static analysis result for SHA-256 c243842a9caa9967…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 08:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88bcfc01bd468a1402041a15ac783855 SHA-1: cdd69c35d6140fa86529d1f74e6ac1a8dc0853b8 SHA-256: c243842a9caa9967dae712f34acf4f6e139a84ba1e1526cc4cbf597090ff7548
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites. Several of these links point to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6b4208c7f066be2e2d2e63dab408917c/faveke.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161192b903a0ac---pobebe.pdf
    • http://backupcenters.com/userfiles/file/vitetipu.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f1d514745705e9f24ebb955c8572faa4/kafaxutevibepixomareka.pdf
    • http://aklond.com/UploadFilesfile///2021070311211861.pdf
    • https://birotex.rs/images/files/wejapeja.pdf
    • http://hoinhikhoavn.com/img/files/pezuzu.pdf
    • http://mhinflatable.com/upload/file/62428171012.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58b32ad8---27275361910.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f6fbba31b15f4cbb0decdb8304b1d2dd/68863852475.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lo78oqg2f02lhrqe2ko410nhak/sewitigodenokawu.pdf
    • http://milkexim.ru/imgeditor/file/72494716745.pdf
    • http://buddhavehicle.com/userfiles/file/10681335141.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b5eb927e---guwepop.pdf
    • https://lordoptika.hu/files/files/vulenovud.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3c54f2fa347c6d6a0265a88a0e2931b1/32011192139.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/kebaje.pdf
    • http://angelcabrera.com/FCKfiles/file/59077600254.pdf
    • http://thevisionkharj.com/userfiles/files/zesiropaxorizinabexe.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/deluzedalosojedopag.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/nenotefuduwuf.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129d59c07913---jikudamijut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+fourth+grade+rounding+worksheets
    • 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_off0000c619.bin
f6b86e9530b40b0f8623b14f22f07a31c9e63bd072f0102414b87b791639f034
pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 10844 bytes
font_01_sfnt_off0000deef.bin
cc337e3a7da88e9957a3d0501440f6a3703f8cb2f6d172c622566f5878034a17
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 16572 bytes
font_02_sfnt_off00010962.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes