Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f345d2bae5dc85…

MALICIOUS

PDF

116.7 KB Created: 2021-06-26 21:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e0ca51e1b7372b31de1c2d21f39771b SHA-1: fb26f494ed2dc2f4ba1c73706708e3b7a20c12c2 SHA-256: 56f345d2bae5dc8556e48fb6764b6e7cfcf6027e731f9376951ba87e0f25227f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to WordPress upload directories or other potentially compromised domains, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://lecapsuledigian.it/file/59113982115.pdf
    • http://phayaotechno.com/UserFiles/File/xisalimawofetoriguwenir.pdf
    • https://medtek.vn/storage/file/duvopurobo.pdf
    • http://goddesshair.net/upload/users/files/38972176578.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49c598767bb748e46a67f360aa37e892/36397695090.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c7ed5641---zonudif.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/jodabinu.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a968855ef35821362c2598104f54d5c7/52828447128.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0441cbcae---65943677741.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe6c54ecc8---viravuzip.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98aec4cf5---likuxewotanudeb.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070116ec09a5---fobiderufudoxupudonipima.pdf
    • http://stasta.com/userfiles/file/81063038244.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/at88l0di91kobac3r26t566sai/balixolatika.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6fc6e232---xadovarorudozefidet.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pejusozegoxepalabogiwuno.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87390992ab---fiwakurapadinilisowo.pdf
    • http://caythuocdangian.net/images/files/60943890735.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ulmls52e2376j4ioibq3t24he/28653400882.pdf
    • https://arredamentigiacobbe.it/file/76820821325.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffdc9c06c---jekodanegomegin.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/68d653669ce7e5e810baa26847e4974a/kaxal.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/kitunizixolubo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=famous+japanese+painting+man
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 16792 bytes
font_01_sfnt_off00014529.bin
4d4e8082f5d5bac06f9388066f62f5caef1d6f55f9b00bedd2466eeb9f19d96b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 10656 bytes
font_02_sfnt_off00015d81.bin
5ca5cee30e7156fbd6e3cc2521ab2be8b71ce708aca046912e26ec6e6989cf32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D81 18528 bytes
font_03_sfnt_off00019572.bin
dc288abb2f2734c6737fcdf5658d4458bb6c6283eff031ec8beab3723fc1dc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19572 18676 bytes

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