Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e930537917fd9f…

MALICIOUS

PDF

79.7 KB Created: 2021-07-19 18:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 319987a95eca824e34146371202d7045 SHA-1: 10fa01727fb7850d763216a2ba991fac0958749d SHA-256: 55e930537917fd9fc72fa7e55e8d4e7b96e7204f083ce2dad13aa241c57782e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is part of a larger attack chain, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ek8ph17o58cgch6qmfnqdql1h5/wutikuzazolemag.pdf In PDF document text
    • http://czdashan.cn/uploadfile/file/2021070908082773499.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/gowumugiziva.pdfIn PDF document text
    • https://capecoralliving.com/media/file/kosuzoxin.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b854311ab1---12862424885.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d283748bf---sijifurawegixasulitera.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16f37a8a4---nudolimawuboridelumitoxe.pdfIn PDF document text
    • https://airshow-bg.com/file/xelosujoxakegavabuw.pdfIn PDF document text
    • http://halmar.info/userfiles/file/90842962619.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/32aa81ac42c3124a002d52e1d3ce1462/zikitenilevugi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b982109b---34705817507.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/32d2660ff3c88bf9cf509aaa0e9fbc02/2361988458.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/12154049614.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nexotuzuwigu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/jibixozer.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/kanup.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-13/20210613161747667653.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160770eee72db9---18535143485.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f47860ffe17d003967010bb15fa91cd/nurujiwazonerufepivotugol.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c8dff073422565316ab105e81abd079e/wulotagufaboto.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9544c8f64---vusilizarib.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/rexogavaperofov.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/nakijemukurevituvoguvet.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f243b2712c---domawugozobufekozosaz.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/vonejibiveru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+insert+border+on+word+documentPDF 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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 16256 bytes
SHA-256: efadda0f080f8c0afe93f51e6ea99ce8ed5939c36eca9dde68b254e5a37cd3eb
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 10640 bytes
SHA-256: b2b1ebffa189f8edc380bfe35be6babe39525d6692ebe7dcd990ba03a8ac4285
font_02_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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