Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc5a1c858ee73d6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 06:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c9b805ccf31bc33115738b4e2d80fadc SHA-1: 788ffd9881a6d22b9bb54e7e27357d2caa107243 SHA-256: abc5a1c858ee73d6dd9c4780d81f07aaedd6e70f91773721af732fd898d7cdca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content. Heuristics indicate the PDF is designed as a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8120cec5eb362fe08be2eae61c3a2f94/jubexutipatopoxukitof.pdf In PDF document text
    • http://cosmic-kino.ru/sadm_files/pugugopasaveburegazulix.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16206195097117.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/gijesazevubazileresanulo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5be7d5bf39d9f4ad4332602708a8a5ae/zenonevivabi.pdfIn PDF document text
    • https://termocasasrl.com/file/lafonupofulikizekerijalin.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88c1604efcb81cdf04cb9237ca76730/wavozitupexidij.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/60664c723a929d7082f2715115c14cc1/75909375401.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0d0a05d20a8ff1507c8c7fa61d62cfd1/36257631882.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44414025132.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/pevanutisemoz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lt6ssd7frijm3bfg7g2oqbmsu2/84713877756.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/38748885785.pdfIn PDF document text
    • https://vestol.bg/files/file/95744325754.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafea5830ef---rilemuriditofu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/76089455010.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bpj64m0ue33v8pd0hv5pccic0h/35883801400.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/kftlgcv0qo381v3n4bknlrvjjm/82902426329.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fcoeol2h3itjju6uqvq65fq8iv/sejinetokalasobetoja.pdfIn PDF document text
    • http://ccshecea.org/upload/files/zetitufowakavixulafi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a492c138a---xivosumopafilekowagov.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/38157606443.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/rebipeb.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/noluwopem.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061914445173499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=requiem+for+a+dream+name+meaningPDF 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_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10676 bytes
SHA-256: 83b217120908a8e4dae71990eb0db66808950ba5e73a0976a52dfe015ea825ab
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 17816 bytes
SHA-256: c0a15829bd35d9401fb9bd43886fbaae367366e9f21999fefccdc02e676dc285