Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bf0fe2608a5fe0…

MALICIOUS

PDF

87.3 KB Created: 2021-07-18 05:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e64d73f83c0e9bbc291fcccb6fd99f01 SHA-1: 50cad81484c9e68a6069603e2ec393a31e270275 SHA-256: 33bf0fe2608a5fe07e429a4a2498bc1a240dc7782e17f646845396c4222541a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and heuristic firings indicate this PDF is designed to redirect users to malicious content, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bed7ebfe0988087a84265df72451c29d/wurogufebumesa.pdf In PDF document text
    • http://caycanh.vn/images/fck/file/butonosowefujigeg.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/73379688325.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/xorekotaligij.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8a5205bc310dcf1e558d6571b567366a/fowuk.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/damagugozo.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zulefasimojiweti.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7505907246cfd0c9dae2ba98c3143d1f/zilotemokaxakol.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/dgk8daksuh2h35tkektgehl6sd/rudemetefavonojoton.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/3577108520.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/68344917227.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/fexipixe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ntpj7cjtdcg7mvhtdjirucdb55/43314854509.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/l0og90m9komha74lmbvso37vmh/80297687806.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/891qfnrb48ss3j9bjjb74pgu54/dazasebexabeno.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9dc42e21c39e4d1ccd03868d03dcb57e/soxunexure.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/bisekizosorexovugiteso.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a853c632ce2---38894910524.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/16p2ehfslmhpentikpcj98o4a6/xasowonepirulov.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vtneka85na2883n0oboeaskukd/44141223911.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/45220052053.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082acdaba4---61501984648.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xemesigorabosuvijedol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=more+help+is+available+by+typing+net+helpmsgPDF link annotation
    • 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_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 11012 bytes
SHA-256: de85bf135da1f6f635f7c6a0c22ebc274dd880ea76a861862a3b624f570ee6dd
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 17856 bytes
SHA-256: a66287465694d01cbf7a8432356f7ed5a4ac94015056793cdf33eb89c27c2992

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