Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaacc934c05c40a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 01:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e7d27004293f490cf1629b4f399a555 SHA-1: 04295b42ae2e0a7292bbc7b5a25f729f7628a2a9 SHA-256: daaacc934c05c40a8dd213d0f647fbf4de13df4e9f2939c58812958933b9a450
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external URIs, including those pointing to compromised CMS uploads and link farms, indicates a malicious intent. The JavaScript likely serves to obfuscate or execute further malicious actions, while the link farm attempts to redirect the user to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://eksan-ltd.com/userfiles/file/28069444999.pdf In PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/tefivazigasoga.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e116b7c59d95a89609cb7da51127728/vigut.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060220005989.pdfIn PDF document text
    • https://agros.net/uploads/file/tetivurerevurulan.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acf01ef9b---jegekekojewa.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/571718330.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80e038d46---bavuxusofopa.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/41401274080.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/dotenonimowaxoxaxetanar.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/durufuxipaxixesunid.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/36ae53101abd66db2743410330354c8a/sogeluxiwolo.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/kefafemaxigelejexikozutid.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/bowapifavuxofijovususi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kutapivikesov.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/21580133686.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/90721372958.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/puxezigugo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gepogulibimusewodu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/saximojon.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/4195095508.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/55c7bab4311e94f6dbbe62c30cff28d3/86125403760.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/zegifekobake.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a164f7a5---lewujosuf.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0d2af3697281b83b2ccdfc640842c55a/defudeberasarulogubaxo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/79930863648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=spanish+reflexive+verbs+crossword+puzzle+worksheet+answersPDF 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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 11440 bytes
SHA-256: 6c39b61b9f37d8cbdc23871b49512063a0c9684165e9416866c87d0684ff0955
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 18600 bytes
SHA-256: 1fd4114c57858534bd5daba629f239238d1a80d35f15f389a185ca894bfe5ee6

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