Malicious PDF — malware analysis report

Static analysis result for SHA-256 b212e899ef08afa4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 23:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37623d030630b7e6d96b343bf6187821 SHA-1: 342e3e2e62de14b3a2817b7967d41aad285e386a SHA-256: b212e899ef08afa4b6ea132a1381f2b5e6d4ea10e378276fe3d96c93d4b27166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and a high number of links per host further supports the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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
  • 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.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdf In PDF document text
    • http://testplanet.nl/uploads/files/fawukexedokaratufa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e7105b2f8d329796d45dad2bc2d9c762/komamajuwenoxedali.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/m5t34277nstei1pl4rfj2m542n/95248742800.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/99344771467.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/12aa763a8ea5a5415f2b4e3c34c508e5/tunifojawur.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/kaxopelowuxekesewuxoz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6d748aac5b1a3b1e727740154ded464e/64160401724.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/76439392787.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rou7hcnlsfckfv7a42877vq280/40802597026.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/26088815921.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/81490971856.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c3665288854c3e51ea0d1fadfed0e61/ruvolomizaga.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/sksj9j6ibgh9dhjesrjj5qn8ur/90216566616.pdfIn PDF document text
    • http://jucal.es/images/file/puvufepatumigevuximu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0af6b4d76b345c0aa32881fe6c60e51b/mozobanodigidativid.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/59688317206.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/57c402e90a23c655fd375bd9199483dc/bakavosexosodulerajeli.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/53272288488.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071236027d46---rekivakonofukoxifutu.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903080506.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/69490593914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=applied+mathematics+3+for+diploma+notes+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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 11036 bytes
SHA-256: accffb320694e2b4606cdbb999d1e1d8cd1c612bf5397c7194c322d7b17aa480
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 19992 bytes
SHA-256: f476c816a8ecf47c13851d665ba23dffe806e3e0d4f371d6b00bc99e8b9b08b2