Malicious PDF — malware analysis report

Static analysis result for SHA-256 25443492a1f4fca0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 04:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66b1d59e74bec9e3ec1bc97f19096055 SHA-1: 55d0d9c4b9800b785d102114358b5974af9101b5 SHA-256: 25443492a1f4fca0cc235c10076ea241f7458d0d499b8b76065908e5450301e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent archive, a common tactic for evading gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vouchertiket.com/airplane/ckeditor/uploads/files/55747359485.pdf In PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/neronob.pdfIn PDF document text
    • http://hidramaco.com/files/files/zerejubenejiwedizoweruta.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nomepigazimapimolagor.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/vefujujifarujej.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/20490434097.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3a011058---ponajan.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/rugikegogiridimuno.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/xijagakusow.pdfIn PDF document text
    • http://www.moyekolodin.com/files/80875867913.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/26789161038.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/18132594603.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/22556338502.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8746806e---43673262764.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/90422399673.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/50599242740.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad5918d0f---somowebabut.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131626a5d4db---123461180.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/puwarurupelufevo.pdfIn PDF document text
    • http://nemochem.cn/upload/files/11434996559.pdfIn PDF document text
    • http://agrion.org/upload/fichier/nafevug.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090214114915.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/1933197314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stored+passwords+androidPDF 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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10500 bytes
SHA-256: 670fca3814085c5b178b9f90d6b1ef62bbe667456f19c9b9a1d3a5e733aa8191
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 18052 bytes
SHA-256: d41e604a73cf3805c81ab4c125f13be41fc84ed89a737865ddc87db627f61be3

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