Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4c1cb79de6e817…

MALICIOUS

PDF

84.1 KB Created: 2021-08-23 18:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4f6f817a0341ac4040bae1024b09048 SHA-1: cf6b8a81b98e1a18072047e7af91d56ea22e18fd SHA-256: 3e4c1cb79de6e817337b01ef09dbdf73fa138fbc9faea01a115bfa00661e24d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://myflora888.com/ck_files/files/jovuvabegaxodubanifaru.pdf In PDF document text
    • http://nhs1980alumni.com/clients/878257/File/16094736264.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a1af9c877055672624d350514e5966c7/1094505858.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625883194.pdfIn PDF document text
    • http://gugugroup.com/userfiles/96474723498.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jigigo.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kapogad.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/bifusadapewa.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/vupijenekizenanomibamam.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/56886646588.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/70672862842.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/sabijodove.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a764e83eb2---38674714390.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1d135985e8afc133444c5ea7ca0d97f9/76519057556.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/98676766187.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vupawukorigifopewagaj.pdfIn PDF document text
    • http://rayanchem.com/d/files/wexupa.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/lunanukaxuvegom.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56e1727ef---lejakitok.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8f9a7ee377753f7ca5dbc86ae19c8e59/35922051576.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa592fbf24d---dimizozujez.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/602cf12e898f7ccc7afe3e93c785a675/72097454086.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9u4742j9t0s6lbnk7v0r2i5c38/rorabijanusemixisawefopuv.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e20112b80---96983388188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=7+pounds+is+how+many+kilogramsPDF 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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16824 bytes
SHA-256: 09bd6971a2c6cacb724a1363db8fb4b4028f44dfbc60d33be61f9161572f7aab
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10952 bytes
SHA-256: 27cd35db56d8be58d625e8f319fa5d8a5e34fb649346989e1cd612f789f92779
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1