Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15779afce60cd48…

MALICIOUS

PDF

89.3 KB Created: 2021-07-21 15:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 716892a618abfe1d14669ff2403b6449 SHA-1: d1c214ac1d23bafeeae2a93ef2857264826747d1 SHA-256: d15779afce60cd48fb970fd91a610172fe84dbdb0238c60c79bc2daeea40989e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413e2be159---42199650740.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/be301373b8e8e59a2b5214a1a2cf098c/vajuxupezejilexu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/53969984175.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074243c124c4---tajizosokufebapudulimo.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/wixije.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5076e7fe7b---19379291225.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/98644693094.pdfIn PDF document text
    • http://18554080.com/userfiles/file/34970823324.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/kekadudovudavogavegukuwil.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/97785388412b68c4362776e2b59ff314/welidamukosisonafo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4fbd8a13---39759730865.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/84971651119.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69e1ed538---tajewemive.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/21a38e6c9d835b158f3f8a86d10ea9d1/66815699792.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/25dc7a2052fb337899a77833fbbdc104/92980264638.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160813589e9777---92832618243.pdfIn PDF document text
    • http://homeopathyhk.com/files/54047396267.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/69f397d0f509e8c1c4a2dd2192c97eab/kixasoselikukezizazewezok.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/86040744240.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/nulobu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/11792814514.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a2641aa9cf6dc6e2d9f234a30bf72e25/82606665935.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8envnnnrcfpt09hvj013vfn7ev/tuxojulosaboxoked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=answers+of+quiz+logo+gamePDF 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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10832 bytes
SHA-256: 7c55e2a8ed88827dc34d779e6d598aff9d01b9ac62c87f1c16e7d232b61680f7
font_01_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 17312 bytes
SHA-256: 8ebaf6a601a8a0214898e14e27b6bc4ad808c59d676c099ee078613502053128
font_02_sfnt_off00013f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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