Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27bb9d253a6b9bd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 12:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e0d5f6f1a69fc64508be62e84f9ef877 SHA-1: e57283944f9a61a184cf4b31dabdc762f5182de3 SHA-256: a27bb9d253a6b9bdf8ccd210270fdad700d6488bcccced45217e97c6b21056a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://kingdomdatesuae.com/userfiles/files/koluwupozefejutama.pdf In PDF document text
    • http://workontext.ru/media/file/48546998359.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/90262784257.pdfIn PDF document text
    • https://fong-cai.com/upload/files/40184300579.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161349813a5f04---kinexode.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/rilovasedi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/bovolirewawasopubobolemub.pdfIn PDF document text
    • http://abnicum.ru/files/file/pafovovuzigibuporulol.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/47764858117.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/feraxozawaxuxeg.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/bulodorusepivemoj.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210904_160501.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/pobajukoxizubusawafigek.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210923123145365216t3ett.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614df6d97eb4d---kimulabumufupilapobano.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210910_509DF90F5929399F.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/35940126989.pdfIn PDF document text
    • http://e-sheremet.com/img/21689573690.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/turokodovarur.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/sagofub.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/murofisa.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///13542840462.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/2011320309.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/12393869776.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/842270d7aaa09ffc3d25209d0f3ba98b/vaxiwalotulafexusivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=image+design+appPDF 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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 17224 bytes
SHA-256: 38b48680c95b221285ecef744a5b3a2ec31432071f722a6aa34b4e4b8a851608
font_02_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 10324 bytes
SHA-256: 10144381050de3fd45f3e5e5d561ab271075d4af606b9903a62a93f03c3010d1

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