Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc1148562ccea8…

MALICIOUS

PDF

97.5 KB Created: 2021-09-05 03:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e29d1b6937d20d1b0dfb6a3dc36535d9 SHA-1: c27962dc8b59d1f04b6630c7ac17774750cbae6a SHA-256: 23dc1148562ccea8e1a97fa3d3ceb96d9bc8b1b11532c4f8094bf716d2fef7e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=prolapso+valvular+mitral+pdf PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9314e6e18d---82616216546.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/92241936062.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/ruramazim.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nozawadeb.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wisakurexagivabazijobaz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1072ddbf02---32922255514.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/93727298195.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e3bc47a---jurugijupopikiko.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/rivedot.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d35316b6---letigosegolip.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/83812003610.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/8b1512dff96a715b07e9ea0d22709de4/26210530723.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/zexox.pdfIn PDF document text
    • http://chipgene.com/image/files/20210818_034407.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/547i30eupfr14oqgh1rfjcuur2/nibarapup.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891889f424---fowaxixol.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/38277599726.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/86097756452.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d367f3f5947cf5b9a0fa4c0a35603a6/93630473235.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/87c2b4c3caf52d61aaed9eaac723baad/gofogosepepofuwagolukugu.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/gogowuvutajisezotoxok.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53393339920.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/zafomorikivobaxuwoval.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_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 19496 bytes
SHA-256: d76ef55402a089c90c7e23ad86232bd0c328d2b66c751ef4cb6460316ed3962b
font_02_sfnt_off0001606e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606E 10592 bytes
SHA-256: 175c05db19434b6cc11682fe465f60e41dfabe5293220aa779a961877af2bf17

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