Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd0a465ef1d7590…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 07:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4f2d1968496afc63c95979143f8b587 SHA-1: a880523d92c8297f373a4c4e75966936aa91be6d SHA-256: fcd0a465ef1d7590bc957a2ad57d44c20f00c71dee3f9ca2dd7934013f900721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as a link farm, with numerous URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=ne+zha+full+movie+eng+sub PDF link annotation
    • https://jiu-hang.com/upfiles/editor/files/30553908467.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161467b68957fe---xosodiluru.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/denumajud.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf99f0482---27445385910.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2e1c4164---44249581986.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f60cc448a1e4177ad136a1947c8b7d2/96940710357.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1632140146.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/73308828266.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/retaw.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/totaxajuzimukesokunavavuj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449bc4e1296---lupumizejefu.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/41488253891.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/71092336052.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/16668721458.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f5e7e963---70406480211.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/putoxixeb.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/60406505594.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/68092fd2c757c768d8565134e8428209/xoripuw.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/punuralizonijidudaxi.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/fejidamibinepagipip.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/80970608833.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/mevokozigazupixos.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d16eb716590d7dc632909c88d8b09aba/71296483607.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_off0000aec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 15752 bytes
SHA-256: dc5b654bedc5af2e681381a22c69f4115ce275c78c56b4ee744273b37095eeec
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10808 bytes
SHA-256: 505f4104d9aa3adc66c1a41e3c8d7c34fc1c2ee49f59970ef2eb5b693b652b31

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