Malicious PDF — malware analysis report

Static analysis result for SHA-256 457f09a16cdf8d36…

MALICIOUS

PDF

54.6 KB Created: 2021-05-15 13:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f02bfde4f05a292830c783c587eff433 SHA-1: 483d9b1f182dc2401b87ac41c3e2b3ee9568030a SHA-256: 457f09a16cdf8d36fde63e6e4ff0c0829445053ac9801dff6cd2fc4310a6c074
154 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious, reinforcing the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8427

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://synerhu.ru/uplcv?utm_term=circuit+training+examples+pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/67su6ntalh9odc20h7mldc5u3f/2410834848.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a0b71f7---wulivadokudugolekepejowa.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cdd33039a401d9702f906f37e6e43c30/febefilim.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429235756122.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5934ee56162b7766f360e17dc7be0a3f/53986818091.pdf
    • http://bebelino.ru/userfiles/file/telojedajosubikebamobot.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082233454683---2058440250.pdf
    • https://people11people.gr/uploads/File/dekirewojaxobid.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0e6ad69b45d2a6eeca8e14e1a737be87/batodobivepofazuluxebi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b14ad928c---gopenamexi.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a4a7147b69fbdd547fec8fcab13f1d11/16914340035.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae8b85c28---gugulozepuguzeta.pdf
    • http://activesolutionelectric.com/images/file/17340423900.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/juzuwuduwipurimixata.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb1f2f687---xajefijogodobadujegodugoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caed.bin
a3e4320d72f356e1834e4ed88bb516df978e9b9e756f76c6876205813120c1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 5448 bytes

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