Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f3edfcc911393…

MALICIOUS

PDF

91.3 KB Created: 2021-07-26 01:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d788aab479826e6ab6427c6c19383444 SHA-1: d3dc268fc4e29c3474e2c38c4578cc65077f9bfa SHA-256: 9f5f3edfcc91139316d507427f1ed76ab8f3d1f37e1ee221c2bba65644694dae
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0963f3285---9237680133.pdf In PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/jesuxenugobi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/23100729515.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/jenujijuxogopapopafug.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda626acce0---61519504671.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/62685664583.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/jumasotuditabowo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084500ca9658---17567790639.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/51991562223.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998b2ce50a5---pagakuwuwibabujelovijaxa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9199db945---bapof.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60314843df---rabobaxutavadu.pdfIn PDF document text
    • https://mavibusiness.it/file/6911646081.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/rexifoxusefuso.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/68274371360.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/78131209062.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f2ab53da---rinaperopujakanegaji.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/747a2c01d5a671a9aa72916926c2c957/36935291615.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/42500988023.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757dd163305---46887709397.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3dce2b5a---76528467369.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/93260533472.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ig746v7ljebilces5ee77dgqva/fawamopixowirigabe.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/pumizepe.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072edbfcdf4a---febuliripetojifadam.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d4e0500f8---5974006434.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3347ce2df6---soxowizobirevesavonawulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=temas+para+trabalhar+com+grupos+de+familiasPDF 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_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 18552 bytes
SHA-256: 064e17318b2051f5981500732c7bfa1d97154e2136a5229f8fa7c34c08a163b8
font_02_sfnt_off000142a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A4 11168 bytes
SHA-256: bcf94dbca61b752d69fda66044facde7591d3f6fbb6daa621f8b5fb242438702