Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52d10c8cebc4e15…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 06:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0da6dbd3dea0c65c9c83db4c820e9cd4 SHA-1: c1a13e6df0a87cf902bf4d4f529e3d2ccb422136 SHA-256: c52d10c8cebc4e158ea90379656c0e18270032111e65df11bdeb90fbfe26235a
164 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 are hosted on compromised CMS upload storage or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fpempresa.cen.es/userfiles/files/54887045235.pdf In PDF document text
    • https://valgott.com/images/userfiles/file/zukenefukinovologu.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/vawazaxiturajudise.pdfIn PDF document text
    • http://hidropro.hu/upload/bidugolaxesumu.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/45601242930.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddb560f02---21555570994.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/bunegujikefepa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301c3745a30---90967912786.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2cb888371c0c40d7c834bfccdb52941/51456573196.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec1f86cbe---68242466676.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210910231517_844677129.pdfIn PDF document text
    • http://uteambio.com/upload/files/lapidesofebuwo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/74878117467.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/11864572066.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/31572809024.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/525e351d0711ed513633e0b2c0b25c36/1360747932.pdfIn PDF document text
    • http://khocabien.com/uploads/files/xirunokiduruvedev.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bowiv.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/luxukesiburuv.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/wefomadibugagegibijo.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/48783250214.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/71347616880.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/polekapibinonozadonim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+soul+silver+rom+gba+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 26872 bytes
SHA-256: 4c0f56d80d028969063e8bf4f9320a1032e0864debf605dc5ffc74155a450a5b
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 10976 bytes
SHA-256: 82b7615ec506232c8b09fe066833556cd80ca8e60cbd9f3ed4c416f731a2c156
font_02_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 2324 bytes
SHA-256: bbbefae59d72fa5124e58854b32580f906c6f54ebd0324db20e82a2f433c547b
font_03_sfnt_off000138ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FF 16456 bytes
SHA-256: 8060eb6a3ae985cafdb74285eabd7937c5c2389014507fa00adfe2272c17dc52
font_04_sfnt_off0001500b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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