Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c07e05958573fb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 22:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eba6936b3050a0747f125e80d359d8dd SHA-1: bd9539d22d2a752a81fa1ac00297b2ad579a0617 SHA-256: 53c07e05958573fbc1e402b15a9b87bd7ab79aa6fe8bf9c9912d3211ea687e7c
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a Business Email Compromise (BEC) attack, specifically a payment redirection lure. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into initiating fraudulent financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://veterina-hrib.cz/user-uploads/files/puvesawafufebuxadopa.pdf In PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lijoxuvijanev.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/m00lrc76teucnk6knjbcen81m4/16518545602.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77034349834.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/81706238884.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/20272049024.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f7e788cf2---2836236508.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/fujewuwetotokodozole.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eac35dc630d7da2c813bfc2237d367b0/8157025644.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/dixab.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/14681319887.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613422c83d76e---vifamowixukis.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/70572781960.pdfIn PDF document text
    • http://skolky.info/foto/images/file/28965759127.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/88239161625.pdfIn PDF document text
    • https://blokhol.com/upload/files/wigosatasof.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/gisilezimetalutir.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/lipilozupuxufurudukavobon.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/sonojiru.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/dolinovaxubanupenobokori.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/73458383333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=move+contacts+from+android+to+iosPDF 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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 17956 bytes
SHA-256: 6531be9cab55a12ab50b3d676bcfa467a09a78ed114270fe5b6ab056c9b86dd1
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 10652 bytes
SHA-256: 24dc5d5173875139518dbf8f8b0bbdfb6d94ba656ce8e15140e2013b2cbded7f

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