Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c58b7fb7e89fa8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 16:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: deadc9c40d7cfa68ec508ee38ca02735 SHA-1: 4cf3dafba97a25841c7a9b80436e0d69e580c0d6 SHA-256: c2c58b7fb7e89fa8ff919bf7436665f85f3e0d1a14d4635b43ead5bb2fbcdc62
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 other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://fine-trading-knotwork.de/uploads/media/basigasuruzaxan.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a5bc0415dbd856cd797e4edcc9ef36da/vebadefigipep.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/97563469823.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/79449125629.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa0e077455---30435696461.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/demofovegig.pdfIn PDF document text
    • http://htwy.com/upload/file/mewusosaxewomogepol.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47a6dde34---89856391170.pdfIn PDF document text
    • http://vhz.cz/user-files/900145472.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kerutu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0da05768be---50781550557.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/79558864088.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///wibomadulajiba.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/buluranatepowuso.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/57056635390.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/98035670878.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/l60qksbt706u72pquebii045a7/99369648688.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb8b81c06---murawije.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93840612197.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/tewetezimemoriwatekanureg.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5fb2f5b00d2679a32427c837a0c101b9/34447592045.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kowovugixotixovola.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=although+but+exercisePDF 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_off0000bf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 10568 bytes
SHA-256: 8481c0ed802fdb923dba94fd142f9dd61083ffa3f1febf348000c439ed4f5576
font_02_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16408 bytes
SHA-256: 38f4fe7445346975751937e856e2fe917a3224b161c911b2b43d34709844d298

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