Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ab37d328acb44d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 00:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 911d2db73e4c83642a35c99f20ca9106 SHA-1: dcc7d0ca61eb32c37e69105ec40763c91f89900e SHA-256: f6ab37d328acb44d9b0259158ed5a93289bc44736ebc904d406466c6fd3d0695
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external PDF documents hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

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://hotnews.md/upload/userfiles/files/63357187026.pdf In PDF document text
    • http://alexhofford.com/temp/files/file/vuxum.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gidenodokebeto.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610325a7bfacf---kekakupu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/fegoguwasexowefunabijon.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093314e79c58---70177981479.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/16783228883.pdfIn PDF document text
    • http://sooclose.eu/upload/File/kagataforurigenifogeku.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7ccac1391ea62fbc339f6d613c26fecd/98623734240.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/53059612089.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/38057557845.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/wenezuti.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5964e669---88289095310.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9fd8783bb3bbd416f8d063d267f8cee9/midakokoxalaxuvedemewox.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/76281707257.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/10742047243.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rufija.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/marokivasuz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160813a4b3b449---dimarezut.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed16616a6a---34942673040.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t90g0pelmb5b07t6kl5mulocc9/rurotas.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/28810183179.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53283454285.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2abc7ab2c54d1b159fabf29e9526b337/32081443537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=personal+income+tax+2018+malaysia+pdfPDF 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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 11500 bytes
SHA-256: 2c9a1647117d6d734f6e7c5818a4dce3f25c39d9958c1c7881a789d8346792d0
font_01_sfnt_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 17640 bytes
SHA-256: 8874306fe3e4ce7646070cb095e7f35374080d14e6a1663350a4457f73f58718

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