Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6591b0ea37225fe…

MALICIOUS

PDF

229.4 KB Created: 2021-06-11 21:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3102500ea60fb907243199417491b940 SHA-1: e8645b090e65cd76fab22f3ac024c95276e6f9af SHA-256: d6591b0ea37225fecbadc2eb253aa58a3169bd08da73e40d0bcb361805140521
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically appearing in the document's metadata and body, suggesting a phishing or redirection attempt. The presence of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics, along with ClamAV detection, strongly indicates malicious intent. The embedded URLs likely lead to further stages of the attack, such as downloading additional malware or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=lkg+stories+in+english+pdf PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f1a10743a2778cae1e4a4bd302f845a/tekifugubuxuninur.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7fdd7a2c2e3467f7c3935dee517d83fb/rotuvorolabuvaguremikef.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/disexoxipunogun.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780440b5638---dexur.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/5103918188.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7329e503a---53475607585.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/171c8ab4e11cd549ccc56a169cbb3c6a/3351964490.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1908b860e---70286690970.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/60533281204.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/jorumasitufamuxafesoz.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/36206137800.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb196c30b6---mavem.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcd98c59f4---pirixewalupevamis.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/16865525723.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/72079832712.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607649fe70e46---lituzewadezukofe.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/030pvvah0gqi3ad9o0ljonh1s4/19234619145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3196A 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00032a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A51 4884 bytes
SHA-256: 1d79c5fc91788a4b447844e50a3f5c64afe6f36bd89315c866a503919fa3be8b
font_02_sfnt_off00033ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33AE9 11820 bytes
SHA-256: 592e40e3cb9d5d6cbb3794094b83eaddad3f0847e5a108ad88f59697e28fe639
font_03_sfnt_off000362be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x362BE 16324 bytes
SHA-256: f1e2280a93f9366b71f3ea4c2bd04bb0b1abf51a5390288e36cce916a22ed038
font_04_sfnt_off00037866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37866 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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