Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3ded79c88d9388…

MALICIOUS

PDF

84.3 KB Created: 2021-08-26 01:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7a4765ed9ff2993a4458080bfe4d052 SHA-1: a3e54f108fe05c593c875c313a2da187888f5f1e SHA-256: 3d3ded79c88d93880a5ae6702ab6a6f4b1a2f555197f71b0dd17750808db41eb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, likely for SEO manipulation or to distribute further malware. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to redirect users to malicious or compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cbspeefte6b0okr34mf34p4i78/zumuxawa.pdf In PDF document text
    • https://sfeerweter.nl/userfiles/files/repifokuxunif.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da991f859---10261261024.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/2822529096.pdfIn PDF document text
    • http://fittbike.hu/files/file/gizapijunezepaken.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/36453725250.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45788dcae---somenaros.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/68131032805.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/59948726460.pdfIn PDF document text
    • https://strechybenesov.cz/content/vumizinabamenusefasirumeb.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/risidijedaripad.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170f48ae4c6---dorurajerita.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/97771836539.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ba9fb361bbf3d63ae18899b27fd6406/nipuvaguzezadib.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160728317b3bd9---46516759716.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/5603913573.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/jepatemilol.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/53614565899.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/13371894368.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/75597298302.pdfIn PDF document text
    • https://hoavily.com/uploads/files/10545838044.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c8ec09a0af62e23184a937670b5efe2b/gijedilamifewedov.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/45670728032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nfs+most+wanted+pc+game+downloadPDF 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_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 17380 bytes
SHA-256: 1a2806dc3ee30bf5bf1060f62a56c0d70cc699229a425c87308c273a704f5fa0
font_01_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 10832 bytes
SHA-256: b0cfde49e163bb0128d3a007b44b65a699889f3473bbcf92b89b3316ff2e36af

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