Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbe3cc99c160381…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 02:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b07e7d0ff557b7dd9ca3e0b08f260230 SHA-1: 7f35658a80bd007ca701b2185d1afef9f33b898a SHA-256: ffbe3cc99c160381a217c74df1d791bf29b7cfa78fe52812a00e8f872b22a412
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=easeus+todo+backup+manuale PDF link annotation
    • http://domario.ru/userfiles/file/92131654832.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/739vl68tukk03to284soc74cj3/43178525206.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5c099a8c7ca2c76e7d545e1673ca1bf9/26151460808.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a677467e20e035ba73913e3df9ece71a/45181815555.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd6001095---bokagikamisafikoka.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/taxax.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/pomozamazafumegoxunuz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1240b08cd7---67772097087.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/64026896261.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/k7le60un2lsrcuassm52ajhpcm/fasulufugofagono.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/nolologamunenufijig.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/26150654440.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4633c3cd---48979525487.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/kubefal.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1418a7c57---36711628039.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210604054556082.pdfIn PDF document text
    • http://seamacros.com/upload/file/nolegano.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/52594221040.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4671096301---8678494673.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/24642786535.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/gixibagapomigokaxi.pdfIn PDF document text
    • 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 10796 bytes
SHA-256: c8e0e2d721212d52914c0c966e1d384b87bf8d5e6bad5774ba68f357f0bbb4d3
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 20296 bytes
SHA-256: 3f9fa4dea5e4288d12f3263a2fccb36ca4698a8cce893f80aff49cf14701bd7e
font_02_sfnt_off00013038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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