Malicious PDF — malware analysis report

Static analysis result for SHA-256 db440aea87eb5821…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 847d2e118bbc996295bad9e6788e86a2 SHA-1: 9e3a50f1afedc864c6f59e038819ffd85c32630f SHA-256: db440aea87eb58218ab9412651d37df7b8ed7bbf761587585dc4d8af0a49d011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as containing a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the document's structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://playbabydoll.com/userfiles/file/25953160423.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4b83b206016da42a0bc77aa4c8ebaa02/95793649732.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/virogisugug.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/ravogibolevuwif.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/telemijoxevurexagesaga.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108080545108053.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7ht0hn5kvf1h877h0cc9k7ptv7/25222425623.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/t3fb7pqq1buqbh5tbscnmo5io2/sofed.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/386f1354303328ac17546ea0381e4d5e/todafemidid.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597150e51b---jumirujiwubejejulope.pdfIn PDF document text
    • http://asvpp.fr/pdf/minamejuvakidadekibuva.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160965748d2922---tosikazokow.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dfba94316c145598288719b6aa4e2e9a/nuvevivemata.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19174f456---3234965448.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/12258729047.pdfIn PDF document text
    • https://stauber.lt/images/files/32769189136.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f86202cac---61488672636.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/15954513188.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/jaduzofozuliterozifexu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/48453293447.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44359511925.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/39387637732.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gobokoxeludebasefogimox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=audio+editing+apps+for+chromebookPDF 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_off0000b7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 11332 bytes
SHA-256: 796b5482dd18c7d99a67f267644b587171e0378dd7e1b5e9c715ca3bfb97fc12
font_02_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 14528 bytes
SHA-256: a3cb8dd9fd3bd81befbb6213e47abbd33f4e1023ad962ccef9babe474c51b79c

Open this report in the interactive analyzer, or submit your own file for analysis.