Malicious PDF — malware analysis report

Static analysis result for SHA-256 2537d2014b0cd702…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 11:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c987ec849aa948adf815fe0ee66dd5b SHA-1: 26d023979f0fd8148319f57e01a47511819fcf20 SHA-256: 2537d2014b0cd702da98e952918b3b588a7b61605e42d61b8e2dd238c03127cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://granitnet.hu/editor_up/34656161049.pdf In PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82373055374.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138bbb2454---39440380369.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7d3d7a3c21894cc2932255cb3c57e116/wujesidipabalitaruvevepa.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/98572998954.pdfIn PDF document text
    • http://yibetter.com/data/files/rupulude.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/gelavisomesuzadomuvi.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///difamipiveka.pdfIn PDF document text
    • https://ptogel2.com/contents/files/15370008070.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/fawibulomenulu.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/12264638394.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/29355907074.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikokuwikewanat.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/nemuvabasorozas.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/95008967655.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/belebunozefunubitagi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/46547940420.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf91832bb---vuxinolulinadopati.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/sedogigoxosixu.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/76339888293.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/42309076824.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/36859190098.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/94774910840.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/22097273126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pga+tour+2k21+androidPDF 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_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 17368 bytes
SHA-256: eb16fa5fd15c8b774f3662006330d1c80e3267670ec65073a2676160431a43cd
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10440 bytes
SHA-256: 610a05d32142846edc66c38ea22d7511cf76eb5f217aaeece5991c243548c4b6
font_02_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1