Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b483ca8e78abf8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 21:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4490f8bc31d55e5533fa4aa77798dab6 SHA-1: f7c9d8112e46d28d1c9bd0080694f41cd6344f68 SHA-256: 43b483ca8e78abf8db0b359a1deb7ef031d027cba4bc26b98e9ccc16c458d292
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were directly extracted, the presence of numerous external links indicates a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://suksesunited.com/contents//files/26564072757.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e88367df3ef---76268128644.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607417cec1364---52807359078.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c243f960b0---vomafugomitoletuzalanaf.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/33485782479.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/85866823718.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/04/9742523777.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/33320686658.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a475538b4d9---27828847819.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fotaveba.pdfIn PDF document text
    • https://agatanorek.com/files/file/9719886337.pdfIn PDF document text
    • http://ty-int.com/files/files/16546249367.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/pufasizuru.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/daberakuzupetemuvebazo.pdfIn PDF document text
    • http://we-plus.tw/ckfinder/userfiles/files/95932334398.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844c4e1dd1d---fopaxi.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/niribopobegorufuzufiburo.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/51674248056.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/du3k5sh89rmplofbm8htkndokb/11583026985.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/71801123244.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/5375155170.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zafajopenowevaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cambios+fisicos+en+el+embarazo+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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 10916 bytes
SHA-256: 949435315a10751af2b17b4f72f453416c02875f9d0a3f10368bebf9427e8426
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 17960 bytes
SHA-256: 03cc1cdfc5eb20b6deec43ab1a6e3a3001a1b5066b04949659c4b12c19e8fa03