Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7832b69c68b3310…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 18:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1df039e4ae677545c65f84073e4e82cc SHA-1: d3ea296cc1771c4f4d07d54bb13726a8149eb23b SHA-256: e7832b69c68b331005ca400319d107bd43f0ea375b919b3a94f287bd36ecc859
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/sebew.pdf In PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210820_2A4FDD76E530174F.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/83316841640.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/saresomiburibuvuxuzadad.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/dazojijexugelu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/19816513103.pdfIn PDF document text
    • http://voijin.com/userfiles/files/23871572857.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/rigogakupuv.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/ziruwam.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/tudedozagugerizatov.pdfIn PDF document text
    • https://majubesar.com/contents//files/13842323336.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5576cd10---lofidabozowimulowovuxu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77bd953b6---80092007198.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607031dabb6ab---70638568078.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/67155647590.pdfIn PDF document text
    • https://phr4u.com/files/fagomimakosewasuzegilure.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/94027730002.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/33916085371.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4b6aeb59d51810ed6ac095a438dce784/62073696377.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/58bd7b9e9488e95a0b99e861fceb2005/tuxafenisunil.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/35538955929.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sc7ftc5u6006d2nbjpfco2ftpl/kumirijinubajitajamiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=caudillismo+en+america+latina+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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10912 bytes
SHA-256: 969754bbce8d8924f48430a68d283b7d9b950ecce555404bc9d8aa9a7df8fcb2
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 18984 bytes
SHA-256: bbb4ac8c2d514f20eadb9a915443ca8ea2cb617620369dff69deca301f5f5bee

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