Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c8dfa4bef6c66b…

MALICIOUS

PDF

82.3 KB Created: 2021-08-24 07:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7af32402010f3cef512fc82f3e2d0eb7 SHA-1: c2451969681a72e63409957a3319411a7c8ed753 SHA-256: c6c8dfa4bef6c66bac2d2990f018daf6ad8b4f5d8ee67e362b1bb0ffa04f4e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other domains, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e9a2b394dcc723b45ee936993c991c8a/zufetug.pdf In PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/goxazibimerusirimabiruz.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/71518884513.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9646ca223e---13792253345.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/patuzuposujimexilitenug.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdfIn PDF document text
    • http://africareview.in/userfiles/file/89489476024.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf54b2a355---65004200583.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1242d2b87---310482299.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607db42d2a362---48171325776.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/todebuloxojugar.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/65728375489.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/dasuligivogowelif.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/xagit.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210708_F62F88E0E54440D5.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/efdf00914c1235a73808ae970802892d/83733285442.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8295df7f---sovetedixisenigudo.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/13440491714.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f57e682f2---kolizurogobojox.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160791b4d86a5c---6284789634.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161037aca86edc---1358411948.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/da7904a75c0fef15a0ea9836346cace8/ripedukeketona.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/33971795275.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b13b9e9cab1de26cb3cc0461abb931ac/30701041018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+makes+an+outstanding+teaching+assistantPDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 16348 bytes
SHA-256: 4e1bd5f074245026940c91ff0d55b2d762db3e9c4fa61383f70f9e8b675eec35
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 10856 bytes
SHA-256: 9bf16fec6dd5ac831e179f8709eea0a79141be4127f466aa537bfaab2631b526

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