Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f51bf2c2c87f5c…

MALICIOUS

PDF

105.0 KB Created: 2021-09-04 23:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 977c0f2ea44cc3e30d461a3254c56d36 SHA-1: 6090bad70d7e06867ae2f72b7f3a49aa64cb97a1 SHA-256: 03f51bf2c2c87f5c992b23c596bf4069be1c93c550f9de2ad9aa2e7376fa23fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=picture+composition+for+grade+4+worksheets PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6bc2502d---99823222012.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xagovo.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/93879971553.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/mufatifegotibikakasolexod.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/telepap.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/gawipaxefisewujez.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/11631381526.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16127953fb6f44---xokegofebonumipegesuzuje.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/xefakane.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8615f582327b03489cbd8ff32edb53d7/4477333254.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/nejopine.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/bimogadatavaxone.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/95930685498.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ludidexutubikupijiwabo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vrg7u5e56d398ocsiepp6ujdnk/86169210331.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zolofaro.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7e70ce359e984fa074ddaae41ebf3966/maneturazarifako.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e206cdde8ce8a9b1e29d94baf9024810/nirewanami.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zupezikizusimodugugobes.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/moxixomixipex.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b7f83f057c42bf811c180742d3a10af1/3279161325.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/33588719665.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/14076977584.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_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 19236 bytes
SHA-256: d71ce8c3dac44ff7e0472b4cf70bf9d6537d2065b09ca91da84bfaaa4a04c2d5
font_01_sfnt_off00016364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7B 11380 bytes
SHA-256: 483f244b5c19d6bb0ca90fde77c33cba762bfb535da6cb103900ccae45ccb559

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