Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b75ddc55a3b9964…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 03:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cad00d347e84d89e86d52a05b1dbb77d SHA-1: 2f18e584b8580b85d9a7c7cb96a141f17d87796e SHA-256: 0b75ddc55a3b9964a68fe6b62bac79fbf7bcecce9d07df663b9c5070ecd3c71a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of compromised CMS upload links suggests a pattern of hosting malicious files on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8207060a66a044c43f5818cfbd884b4d/22239302698.pdf In PDF document text
    • http://www.chatanakonci.cz/userfiles/file/87640826648.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lr31f8najvb7tb416kfsnvb8s3/53502957235.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609749874bd7d---51940862560.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9201b14449ee0ec080115814bb4c157a/nolafidajorudoxedunuko.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6f17b0d84629347df13e3fb5f26981a5/xopisuzevomu.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/10794017993.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/tososonal.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/c9s7tthik9all1o6l1234s1jeh/gazakeluzufudozorif.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i5t5ln3c02eftijgc4r8ps80h7/14294243677.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/58b92bndbioo5757vibag62nob/63480002435.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/vuwiginutewo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eaf166dc4---kixasalelosefu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8519c7392de08558cb0c0e5c3d6910ab/78534126464.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/68766558229.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fb37aa0fb8f5ccd75d8e543141dfa1d3/64095662317.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/49629121596.pdfIn PDF document text
    • http://hydrem.ru/images/file/vategojojimedorabuwepa.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/ladavatix.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nenowovaxubopamibav.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2a4e6d7d703d6c5d7643cb1a9d5b7d3e/rexamusagano.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sotobivuv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a19qrmoklvh75r4j3lji5qf0g6/dibunefutisumoken.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/78724709610.pdfIn PDF document text
    • http://starsunited.at/upload/files/52959104211.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kezudiniduleriwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=acordes+de+una+cancion+facil+para+guitarra+acusticaPDF 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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 18900 bytes
SHA-256: ba814fc543c58ca94f89801ea670d0d816373499d733ea79ee0fd0c05a7d7da6
font_02_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 10876 bytes
SHA-256: 8db328767349a4dfe6d5bfc3e3423f3bea49f8e4fd959647e0bb65151ba031ad