Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd377d067264012…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 06:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba63e7a9d1cc11f7763bd72a4bb005ff SHA-1: 616beffe29aef16078db6af6f76adca62201e771 SHA-256: 8fd377d0672640121a66cd686e85491907552201e5461c29f9e779b467312aa9
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 numerous websites, many of which are compromised CMS uploads hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://abwplazaview.com/uploads/files/22682467447.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c80f12b30b55262f6952f1e54850122b/62648158863.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zaribaxav.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8aba3d01434d268a5852b8e740de56b5/limukifag.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_030047.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88cf2f35b8---lesewonumad.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d79b6457---24563869020.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/q3psajs8o90fguktlrk7h50efl/febisuwerupadixometirexul.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/24318052905.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/57894943514.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xupafibuzo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/45036332226.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/66367241624.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2c469d9a---87402716310.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/60826003421.pdfIn PDF document text
    • http://beiks.info/public/file/79073047301.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/17346680634.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/76ef362dc922b7db659810830f3c6ed9/46795027553.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11ada654e---jubuvetugupepitinebawop.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ipt4a53dpvsrr2egvd3m396te5/21283824702.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26860a8cf---jobotusonukizupiviravu.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/juxusimutemejom.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/kudejafusupanejuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gotrax+gxl+electric+scooter+manualPDF 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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10812 bytes
SHA-256: 79f7253663f63a79fe43593962876cb343afe0a606e268d11ad767b86115a4fa
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 17284 bytes
SHA-256: abc644a150b41cc409f1fca31c14f3fd7468dfb7b42622e05dcb6fecb1a572b7
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1