Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc3cf2d4ec20aec…

MALICIOUS

PDF

112.7 KB Created: 2021-07-15 12:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50fcdfb476a3b8fd612aa9cab88ee826 SHA-1: 78e2f18147d92186a50d07547545c7eb80f209b8 SHA-256: ebc3cf2d4ec20aec232462de61d6224ed1feadc1149c5ba0032c39f3513e9202
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a1a35a07---fibekejavup.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b027c9a8---tulapam.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f31e464ea4c525586db06e615989a89f/lefipaxotovigapatonu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kudaje.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/89271a0346b25f28fcfdcb128cf0a920/dizowuvulejor.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/popazalitopapa.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rtsijjuakf22f7denjbb4dk974/tujawikux.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/turedenu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608008177b9b5---mesulexegibokojawepa.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/xipaguvamerawiz.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/jegixosetaj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd2c55e88---bumumilisesakatogem.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704d8624a79---piriluxenapogug.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f43135c35afa4089e65c4df5a6b05a9f/kudozefumolupi.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/95068675932.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/42f707ccca9fc0057881ba8b38342307/71963683713.pdfIn PDF document text
    • http://cocoal.com/uploads/file/numidutojegabapedumiwokat.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092e95d09b83---zekozuz.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/wipiwebarudupamovelup.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7592310969---13694795670.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3f654eaaa361dc4e060a1d25cc52d2a9/mibopatiribu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vokagoxebokotatewatido.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22cd17f5a---vovibogadivubifukola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=building+takeoffs+limited+incPDF 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_off000155e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 10964 bytes
SHA-256: 40e0c900a8b6a9fee0910e9dae19c65835ca9f990dd9f6609f25d551bbd91927
font_01_sfnt_off00016f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F27 17584 bytes
SHA-256: 9e8a170a3cbfec1918fec2cdbfc41e6e33baf2ed47cfa652920c9e30af7de3f6
font_02_sfnt_off00019d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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