Malicious PDF — malware analysis report

Static analysis result for SHA-256 791dd1fb2134bda0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 00:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d106abc18d3c8860532cedf0428aedf0 SHA-1: 5493ccb083dd441fd4e6923931640230be59f100 SHA-256: 791dd1fb2134bda0228defd471c478aaba0b86bda3865dfd10cf6ff7dafaff05
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier strongly indicated maliciousness. The presence of embedded JavaScript suggests an attempt to execute code, likely to redirect the user or download further payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://crewmak.ru/uplcv?utm_term=flying+car+san+andreas+cheat PDF link annotation
    • https://stallion-international.com/userfiles/file/xasalunu.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fakuzikolaxuvoneboxedo.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/50151197781.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/bajukesujezevu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qg61vavrnlt2o2q2vkklr7hgnv/madafuwasisizipafonuxiv.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/25977827371.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/labikema.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/fujefuxazatizi.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/26078724143.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161410f6dcd6a8---xakokidasemurovevevi.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/dexupowefafejifovara.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/42977743847.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/39310044892.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/dojavazevunatofazakojowi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/39033309615.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/zujokakibog.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xasukosepakopejamudi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/tubebowewal.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5f35bccb---wuzatatal.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130856130f34---rerozajivewazelujejeg.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3ef03907abcaebcac44a7cfc4675dacb/26549566404.pdfIn PDF document text
    • http://kmsenior.org/file/files/rekovate.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/futoganaxoxufagow.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/semuw.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/zabofaxuwadalapaxa.pdfIn PDF document text
    • https://equimat-cheval.fr/file/subuponafixobuziref.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/72582199956.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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 10620 bytes
SHA-256: 237c21322f46405837dc4869dec747ded3c4a903048c5da340e542f707cc3d2f
font_01_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 16644 bytes
SHA-256: 8f25d13f143a69c6ca80a0ac7dea7d0816bc566263c5d78e9b706387c07b90b3
font_02_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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