Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd55d4ced32c4476…

MALICIOUS

PDF

97.8 KB Created: 2021-07-03 05:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce18c6f809b89a53bc14d74de26352f8 SHA-1: 30f298e5de530c7097b5c453f2be4ed9de19bdeb SHA-256: bd55d4ced32c447633a4a3d5c243cc2b6498e1e8c2c90e8def25efc5b04de931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution campaign, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://oniceh.ru/uplcv?utm_term=5+minute+warm+up+vocal PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a2641aa9cf6dc6e2d9f234a30bf72e25/82606665935.pdfIn PDF document text
    • http://fitviewer.biz/files/file/tesakarifetiginevopusopa.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/691202849b33973ee43d0aec2f3a7995/23265133304.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/10a292c05afb6d2ac2ddf9ffdeafada8/92114415152.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300022498615.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/14265150b31502f4a1cb641db442ed4b/95507699066.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mt06g8ao6p1s50d3u0ivea14i/33209744976.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a19417267---meliropowikodejob.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c089949b1---kotoxolasilimenuzire.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962fb12f07e---44562522823.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/49514791392.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090833fa137c---39764980047.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/bozel.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/vawutofo.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/wagotubamu.pdfIn PDF document text
    • http://dakmet.pl/upload/vesetutebefez.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/df3f073f8ffc5d9151236b6d5a45b32f/93753257325.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90706d64d1---34421641923.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/76684385343.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/87174748281.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fulefiwep.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/98317649657.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5v10e6b462cifdhj50shpu10ps/35840660692.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_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 17344 bytes
SHA-256: 7a39620d68c8f4806f40907abc9fda00c3712a5b3dd4f45d69abf59b5edf13d9
font_01_sfnt_off000149bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BC 10656 bytes
SHA-256: 6641e7a07532851be7738dd61b183b27c67d7b12f76c3b061f3f0273ab4907fc
font_02_sfnt_off00016227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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