Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a287885dcf34906…

MALICIOUS

PDF

83.3 KB Created: 2021-10-09 04:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e218ad78cf87426325921afa4e37625 SHA-1: 0c5cab8f47c5de04b394ff810ca123591a90ce45 SHA-256: 7a287885dcf3490669f9dcea686e892a512e8c60181e3196baf23a36048147db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but reinforcing the technical nature of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=above+and+below+sea+level+math+worksheet+answer+key PDF link annotation
    • https://soi.icami.mx/ckfinder/userfiles/files/93285352350.pdfIn PDF document text
    • http://fuchs-orthopaedie.de/UserFiles/file/43353712546.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/andqfk6fdfmh60sga93hhdrsi9/1854848651.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/pulopokiserisuwinikelenez.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/98640765888.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/koxegovisukazodusulebi.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/10216502015.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/fujigowogipezizu.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95161824148.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedujatajasurogijijati.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417c282cf5---samigogavafu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/kovixebimiti.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/jupizalipazive.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dj6htgh6rmumcr5q0pas4frl2e/26263624963.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/q2ginqchbpt17khneqo4nsea6l/zexekagekeguzenebej.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kegilowajifebasudiwose.pdfIn PDF document text
    • http://caythuocnam.org/images/files/papew.pdfIn PDF document text
    • http://lobi.md/userfiles/file/81411290729.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/46884441002.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/61984356856.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/65276247430.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/nudekotomim.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/vararisoganelavun.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/lasitolona.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3e3f975363ac9dc42328012c958b322b/65591832485.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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 10900 bytes
SHA-256: c20f5f87bddacd01f2c9a387c21742505502d7eb60d2068d57f0d525c401c990
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 19732 bytes
SHA-256: fbdaa32dcb35926abe75e93f0e98d2a1a4b50924cbd22780e3b5e9e792786705

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