Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff0604470a30d2a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 09:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 956c0f98f2afd4406204cb610eebf8e2 SHA-1: dd1f8efa462d99c6295ddce2752531606d74baff SHA-256: 3ff0604470a30d2ab5d846eb7b61570818f0c287258eb7a48b983883abd2ec01
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://beautybybelief.com/admin/images/file/benaduzagedogew.pdf In PDF document text
    • http://uelzecht.lu/userfiles/files/rofoworetezuz.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/57845609499.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/70784624199.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c2dc9d3b41dc29fbac83602a5d3a2da1/lenofidufabemugibixegato.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/25961849589.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102bf485784c---fokazol.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/duwevonedaromuvejuzit.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f99080959---tusibamamagatedexozakapa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31829502935.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf16f46f9e---birixujugulokesitilujevo.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/rakanerizubipumugaf.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/t58q07c20t1cgu0dtr46bo1bk7/degub.pdfIn PDF document text
    • http://licausi.it/userfiles/files/gisoneva.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/83973487012.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/35640211013.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/20454272955.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719fc146484---tavirubil.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/11661735940.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13efed20a---7167341214.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/mobeluki.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vofasepusabejoxufadaxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=investigating+oceanography+2nd+edition+pdf+freePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/67619211276.pdfIn PDF document text
    • 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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 17504 bytes
SHA-256: dcb1b8cc47ec9a77054790f22e9891c8b62c54fea4337be8199ee87b24677658
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 11104 bytes
SHA-256: b6aad88d34e4e0990430973fea632418f1211854e5d6026c06b433341c150ecd
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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