Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6506a1864d5dcf7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 17:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c77f2eb6e69c2478052b716d8a8863ee SHA-1: 4d2cfc39fb0219ce7f2109466da8229e4212cdd1 SHA-256: f6506a1864d5dcf7c6b1cdf1a6e27503ce5e05c708694d5a8b4a455173ddf6ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF acts as a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091a67dc78a8---37136312416.pdf In PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/74381859771.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/37283108824.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5a059017---77335765183.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/d199ad741f483c8b2ef89977f915efc8/xakaganimobanafu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/3d6385260ab17fea5709822672b17b2b/25071866808.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210812181118.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/relolubaladarilubipanu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/demow.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cf9410384a47112f7c066ed80aa4d827/fozilogegozi.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1629443326Sbp8.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/59922631419.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/73335486623.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/18855890685.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/318ae2a93f1cbe87a0634694f6bcf718/lolifepeluzuxunajav.pdfIn PDF document text
    • http://bluebossa.pl/files/file/woveki.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/81188472338.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162471416619.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/2054095779.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090511631c6a---73747747546.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea62bebfea---21461582416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+watsons+go+to+birmingham+quiz+pdfPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/13699986476.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 11396 bytes
SHA-256: b0ced8da6c49afabd7be1a4f1845e041fdb116c0fd28ae993f38ed01b3c414dd
font_02_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 19020 bytes
SHA-256: c78a78640173c30e8a54192e62a6e0b2a103bf9cb9039ba5c478886aaed1a1ad

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