Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b73ead5f6aa5edb…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 00:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ba4c6c1dd83494c74c6e94095b43ae4f SHA-1: 03688e7529cabff858e6df01ecd42ec58cef6867 SHA-256: 6b73ead5f6aa5edb1410dcd3f25d8640763d2988c1347329b2db90a7ce2ad827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdbc78471---bijulipolitanav.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/979058d7be88fd54c98099a9f1e28815/pixesozizopamugabazuda.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3831a13ed5c9d3caeeb7e45a35760d97/58301860906.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9381957f2228a843013b12182599adbb/zuvififipisasul.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/20645825258.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/62433476011.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/59630202465.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/344b90317512a572eb8afe04e3835853/53496971717.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/namidimigawoveseda.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086425556ae8---rodubilubodanuzagilonox.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/juteberusosaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/85691499660.pdfIn PDF document text
    • https://kede.org/userfiles/file/pimapaviso.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0er384olth7oqd660r40qgn0oo/goteximifebipagami.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/zewisuzisiwez.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/67103795091.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee33c3b83---domigenolavif.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70346743150.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4aa5946aef91fb104f5895b93bc79e10/39671396500.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062619432773499.pdfIn PDF document text
    • http://adveotec.com/img/file/84710082779.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0365a54ec9859e706cea87e96fa701c3/lowepiwinakafojabeselikos.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pugasaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=famous+carnatic+songsPDF 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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 18368 bytes
SHA-256: 50919381802bf24c4956abc8d34e2c1efd96934f08a4fff7c6af1a89023d06f5
font_02_sfnt_off00013954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 10472 bytes
SHA-256: c11ca99ff734b3fe5e25ccd72e44249fda1b2d2e50cbd2cfbfcc88edfa52b3db

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