Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c696b4bc2a1d00…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 22:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d1c65136adcf328c4daf8ae09b9485d SHA-1: 1919da3f44b6b54c2257f72383383b99526b3abe SHA-256: 52c696b4bc2a1d004ca711b12d0685f6449e8726b408573ac82f82bfeaff1d62
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external websites. Several heuristics indicate that these URLs are part of a link farm, with some hosted on compromised CMS upload directories. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable binary data, suggesting the primary malicious function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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://petikdaun.com/contents/files/10971516579.pdf In PDF document text
    • https://espiber.cl/images/uploadedimages/file/sufipogadofejizebefivanu.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/55238282844.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_51C53793E26B72A2.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/69790883890.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/litakine.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/3934591293.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/32982806461.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ero5eqvgu2562sekh1nrad6q1i/suratemugowatasoz.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad55eab354---77971920128.pdfIn PDF document text
    • https://ratodua.com/contents/files/81406727013.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/21268768773.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/77637805003.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acec02ca29---velasopajebalexiwozukeri.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/fugaregadivitudifugepom.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/12914418659.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/44483249690.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/26214203689.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/jutagij.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7881e22b---gukewukulotigiwa.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vojarokekexumejopuxexa.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sisovebitizeme.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vozuvifuwofa.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/fufodaxonek.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/kaxupixu.pdfIn PDF document text
    • https://razredna-nastava.net/files/vizuvewosobetuneroxofaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+free+online+movie+sitesPDF 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_off0000bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB8 10332 bytes
SHA-256: 1cb585cd7f16708cb9a68c2063f3b58d50e65397ae8f7d53df6da0b58a702cb2
font_01_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16116 bytes
SHA-256: f8162f62a358e96c45bcd75acc3b458f9cbc7b8976293a952e337a6c02ad626f
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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