Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb54325059745964…

MALICIOUS

PDF

121.4 KB Created: 2021-08-16 14:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df2d12de10a87e1adc885748877e75d2 SHA-1: 7ef64ad372a43ed7a8b3b578f9d2d993764633f9 SHA-256: cb54325059745964fb50d617c27eb9a41aae5a97a5e89e194107239a85b6eca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • 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://krisoc.ru/uplcv?utm_term=how+to+use+corel+paintshop+pro+2020 PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f673a17cd250ceb185a927ea9c5fd87e/vekenagubo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/rozuwadejusujuwuba.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/mefedazonotuvogene.pdfIn PDF document text
    • https://artenika.pl/fck/file/noxuvaratesasanuze.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/zedadeja.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/25092682837.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161182527d21b0---sozasewefajujiwexewobopuk.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9fb3433b69450495cd6396783fdb210d/sipawidodixowe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828cd989ec---vesufuwezifunefi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pugosakomexelibunalodusef.pdfIn PDF document text
    • http://ridendo.cz/files/file/rugunefaku.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/mujuzuvodavuwalegunorubok.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071680814ce6---40897075868.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zunowoxulaguxoviwigowu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/44811802078.pdfIn PDF document text
    • http://aimic.com/userfiles/file/2453256779.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e1f2fe48---ramekijep.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fac05a14---8996772173.pdfIn PDF document text
    • https://raljob.com/userfiles/file/xoxaxif.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gimadila.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a775e9357---27696172613.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/litagowuxusemimusuno.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9f4f997efc4b7653b8ee6c588191eb28/85166429414.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/648e6bd9d032bd4668a649baf26a94fc/59191798893.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h7bumsdk8rr7v5lse0r1207bug/23501023235.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B88 18000 bytes
SHA-256: d2c2706014032f0cd421cb5679733f38f12f231991714e01214573a248d2e79f
font_02_sfnt_off0001aac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC9 10888 bytes
SHA-256: 8a5197009cd37111b056b17077d40178ed8e65d85941d7c9c4b500be261bf8ac
font_03_sfnt_off0001c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3F3 4924 bytes
SHA-256: 1373ce65701bbae1b3dfb961f3afadf0660c0c44c03a637c7a9020c60654c9db

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