Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fe3c3577b00d19…

MALICIOUS

PDF

73.1 KB Created: 2021-06-26 01:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7093dd17eab737ec8c6eaa712e470cae SHA-1: 2d8716572b6e7d530fdb5ce84c123986441258fc SHA-256: 12fe3c3577b00d19e96c5c7a650b9fb64c667ca8e8718478f997e4816f2e5ef3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload directories and disposable hosting. This structure suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/18f379ac188750b34275663da37d2d16/96632529546.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607beab98c5e2---jisozobagoregojafa.pdf
    • http://jjkxmy.com/upload/files/202106230713407098.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tllincqg8aoras2gcnavqd9pcs554kjb/82151872709.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2d29ddf14b2ad5aa6fa03f74c20c3796/tafidevojuvimasiwile.pdf
    • https://rabudiagnostic.com/userfiles/files/defawijaduw.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4f785724---venibaweditamezujun.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210605_E416A686E5CCF661.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e993ebe0---93001918110.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b350580adad---56287780108.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/78c04d597a1a57c7bf9cb8b80835cd64/39536712107.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f728b0b2a---gugepozezajabinuk.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4a933451---jupuvajijogevarapizaneti.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff910abee---kagirivanopiwofa.pdf
    • https://poolpoint.be/uploads/file/38553641488.pdf
    • http://patroha.hu/file/biserirojupekawoxutosisa.pdf
    • http://eviljoy.com/UserFiles/File/33811241036.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9c415b9ef2b1ab201f317acfaa6a4be2/48598380609.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kbur5nc606o2lvkfvjfk9hkkpf/14630915643.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/gewuwezefilevijagefo.pdf
    • https://abe-rdc.com/userfiles/file/17735137672.pdf
    • https://ecohort.info/userfiles/files/60995535867.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=year+8+maths+worksheets+pdf+with+answers
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/72b01498e05f6c8ea1e14b4f801eb1eb/sureletatarozidafif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc3.bin
0c1bc012dfb5ada41cb1499666016fc12fe08e157c41e3c91442e3529356f458
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 11084 bytes
font_01_sfnt_off0000d584.bin
bd7ed69afe3cd5f985fc7ee382cf2bbbbffa0bf076be181c5f0f7654c696db98
pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 15992 bytes
font_02_sfnt_off0000feda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16792 bytes