Malicious PDF — malware analysis report

Static analysis result for SHA-256 db826dc5188f79a2…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 14:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d81c2c53512af123d6955f4a64b536c3 SHA-1: eead3e262d88aa5442f12be0ba34741d591c7054 SHA-256: db826dc5188f79a2e12125a8df45ba2e1023e5b3cdabb5f35f3d7b17a3ddde2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external content, potentially for credential harvesting or malware delivery.

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://vibingvibes.com/userfiles/files/kaluzesolel.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1b669d776f1a656a49596a743921152a/nefobizafenurerunositole.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/98041867351.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160db0e24b3780---legadegejoj.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/demuvoxifenuzitat.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/rujogitiwuzatuwasoti.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612a410b73474---wizemalegutiwoxo.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210726124727.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/pawok.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/no8aii0v7okk8a0d2k7tbtb32o/wodesupetaxefimegajosigop.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/edt7ibnql65chnpd2cnu2jb4d9/sikemogaxuduwipo.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/lajinoros.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01f7e6509---totefegumevegakutog.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/majosazarevebomizo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/banumegaxovinugakawuxaf.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/n2r17oh8pa6apjbeb7f0ftgf9q/92497330340.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lobufusuzizefekoze.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/rilazujoxemegelez.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/67948901323.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bf658a3fd78a8367c1297a1cbb3c392b/96304755822.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210802164254_1xr65b.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89285251944.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gogufenafisibubi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kbprrpc12rt325jnt2cato6r66/nolirupipunufiwuxijejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=los+4+acuerdos+de+la+sabidur%C3%ADa+tolteca+pdfPDF 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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 19628 bytes
SHA-256: 57b7ec68c6e890bf8f2864d458e795344a237231ef9a979c687743c4ea01fdc4
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 10844 bytes
SHA-256: 1074509fb9b5b04c6feb1cead3323b1a7f51de16336762a6e6180d73fc1b14af

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