Malicious PDF — malware analysis report

Static analysis result for SHA-256 253ea0cfd9628f13…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 00:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3f419ec772ca6f77eb43000ef374cca SHA-1: 16b377fcf100ed2e7cbabca81ee87b96823d327f SHA-256: 253ea0cfd9628f135840feae7e105be3cc47ba7013f88ed7c54c60747cf61d86
156 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 compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users into downloading malicious content from compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59fd5f4133---zodozavelezilag.pdf In PDF document text
    • http://aqcons.vn/upload/files/10832635352.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c372198ba1---gadeletok.pdfIn PDF document text
    • https://plasy.com/uploads/file/10852383528.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ssals53gsqi137tie5dprqbki4/rowozizomiwinukezagolil.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/96929906769.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e484b43b67---10781407916.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dalup.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f169e2da---zodelevebif.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/98918017209.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/82f597710346174dca893f28578521b1/devarosemuperiwowopejek.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/vozimodifiguz.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/39096574826.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0d85c86b---fikefafabipekem.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/taxazoridutufikelasod.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/kojavedojoxuzarobowera.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8f0f93967166d54900c672ec8e1315d2/gemeguwabusazamubasuloj.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6f7d5c8df85bb06e1ca46de45ab1b425/90054485861.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bemadisezajonaduwap.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/31201120432.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/62716245232.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/gizamivozutojelolupeminex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=comptine+d%27un+autre+%C3%A9t%C3%A9+spartito+piano+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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 20620 bytes
SHA-256: 151a00c18cefa27a18c3e533e408aaa525f3e1e3efb5551fb547ec42bccfc8ee
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 10932 bytes
SHA-256: 74e3d5eb73811342ef8fc45a8eaf7bac0857c37ee4e14da61046ab5449e5ba66

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