Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f8e1496d8f48d0…

MALICIOUS

PDF

87.4 KB Created: 2021-07-09 02:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2d5dbdb6d3c08978267289058dd73b6 SHA-1: 0132e13c857387ea89d9e5bf02b489851d03b4a5 SHA-256: 84f8e1496d8f48d0b86c25d4fd18967dac4f75992c48df120d4846f66ee0dca7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The primary attack pattern involves directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fundreamz.com/ckfinder/userfiles/files/87222426794.pdf In PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/41017457705.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11e27a74f---54879230513.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160897766c8e33---soxenonabajutezoxok.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tazimirur.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jfv14a8clao97b9thcn1qcqsu5/fezudavin.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vajabomegaluvameg.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bfdccap13uomeqiph3udh62hbc/bobofovimiziwotumo.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/bifikotob.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/80176998068.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a0449398---39004621158.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3e8805222d682249d2f091531078c24d/lovujewamofu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87646c978---44399980122.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/detalelolojana.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ff53c716bbe7963e7a4d42e259771851/74316901490.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210701183408580.pdfIn PDF document text
    • http://healthywithhart.com/res/file/donarewuxobeke.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kajireza.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9517ea37aa7bfdf318b06fc0ddc033b3/mutalonixarilofagis.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52784e65a---85645404623.pdfIn PDF document text
    • http://fygl.net/uploads/file/261458195996.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2curcjie4h682t00rcr4l0e14p/16915522319.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pujotu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b754a5c163---69000353136.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/jokusop.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c2ebacee1---6156746144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=features+of+persuasive+text+examplesPDF 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_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 17204 bytes
SHA-256: 5d16ea4d2bd298c9e69b65f1837c9c90417bc167ade9bb39ea67fca02da76007
font_02_sfnt_off0001376e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 10660 bytes
SHA-256: ea5ebf4dc1d480abd3fd3c9029f071b8b415f9a810a01a0aa8d14588f8ce9b82

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