Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d6a921464cb35a…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 14:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6afbd96194eb568df341b679c0e3f7a8 SHA-1: c5102ffcb0f56a8294374f706386063d1b8f789f SHA-256: d8d6a921464cb35ae2b061927d89932f9040b0337de97f2e27f08c09a970e4c1
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. This suggests the PDF is designed to lure users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87300875780.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021070519370234.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/kixaponu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/mipolo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce127f168---26314111667.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160efe866d2bfe---jugowuva.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/33447281910.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/puzanixipo.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/zafelezizugoxos.pdfIn PDF document text
    • http://faradbox.pl/files/file/tejemininujutexi.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/zinesuvomimegitezigaximo.pdfIn PDF document text
    • https://eternalbliss.net/file/vutiwoxezirisogub.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/219d71f7968df5d4bb08dd71c2a23b55/wazatadiwolasokomowux.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e9qasdhgi2qv6lhqo04v0gat4l/bejekuni.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zokafelawib.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/23444856425.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075936db9f6e---34953111544.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/35679867454.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/xojobavijavi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa1b2890f---jonevefawidudiv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c056dbeb728---79371531685.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/39398778610.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/75043612392.pdfIn PDF document text
    • https://mackbeks.com/files/file/45532192281.pdfIn PDF document text
    • https://geniodelweb.com/file/vekaxakonafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=el+vals+de+amelie+partitura+piano+pdfPDF 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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 10808 bytes
SHA-256: 93ae4ccda295f121435436cbe7fdcc22090c783028fc63235cc53a71c6e5eeb8
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 17604 bytes
SHA-256: d7c8dc235736a6e5fbb34ddbd81ce64ffe52bc30632fb9b1e61b9e81da104515
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1