Malicious PDF — malware analysis report

Static analysis result for SHA-256 d793db2720ba7fc4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 01:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bc99a4953842d7b673ea3e122ad97b9 SHA-1: de3443e4de97696d67709e9218dc5833bd751f58 SHA-256: d793db2720ba7fc49dc000b2fc63249c0242cdb94e0e1875de29abb69daa23df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this, suggesting the document serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6382

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ketchas.ru/uplcv?utm_term=website+to+android+app+free PDF link annotation
    • https://mangonebike.com/uploads/file/nufakapopinubizamus.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/20lfgg92eilimpfmmgto2hcp45/46955965879.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/10251344731.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210917054912331241pvd1j53v11me.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d02d0583---fonaravofovop.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/torifetumurof.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/sebazutazimepizaje.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/44210962646.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/lajenejuwowugafigaga.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8cab47aa0bd9a953c637907d9f23799f/fufifotujizelemogirejaxa.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210912083818.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/51867610699.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/nikov.pdfIn PDF document text
    • http://tcihk.com/userfiles/rusokilikusufokedukefum.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/29334560660.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/dalotiluwetis.pdfIn PDF document text
    • http://dsraxys.com/uploads/35855142202.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/21837027986.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/gisamesobijulotexamuwuta.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/nefaf.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tetodefuwibavovamejujopaz.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/97708826010.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/3815763659.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210903215504.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 17812 bytes
SHA-256: 2360d779f1f2ea27a20c3dd51855c411f27ae79e9c7d4a49cc612e230c316937
font_01_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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