Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea50b38c5520a11…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 15:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 320f842538ffc77737205069e5cca666 SHA-1: 8aa3e9d02ef6fd6eff6ad89df3c65fb6fbfc3627 SHA-256: 9ea50b38c5520a11c081f7cf98b40b0cb9500e63580241df66a38dff48ffc56a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=yo+yo+unlimited+coins+mod+apk+download+hack+mod+apk PDF link annotation
    • http://www.verneteco.com/ckfinder/userfiles/files/vusari.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/93783996952.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/nesokoxo.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630782932/file/ruxojovakis.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/335884774.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/tawinenip.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/93765551862.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/93428042883.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/72615507226.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/74759129759.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/219954f92dd0f027c6439e5cb012e93e/91107721842.pdfIn PDF document text
    • http://jsdarvin.com/files/55515186245.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/wijiratup.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/norenaxoxijap.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/xekogodiwejesekoluwusox.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/lapevisoxususefoxe.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/penaxunabololugedalaseval.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425bf7e4a11---25473885897.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wemunupovuxutan.pdfIn PDF document text
    • http://jinyezi.cn/upload/makabek.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0960968ffb1131b3238531ded34ffe69/kajemoda.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f024e5a3---75714260071.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aaesh2mqtsukhu8qgm51eknsmn/80751984061.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/17/file/20210917_094044_196.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/48381028325.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_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 18032 bytes
SHA-256: 353720a0683e0694ae01d2eb8b2e1f310137acd4a2bd13700c550ebd1d44dfda
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 11056 bytes
SHA-256: e1d33d3520636be85cf886052881fe7fd7e771d8f7a24022a3890e3d65565ef5

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