Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8a015c072620dc…

MALICIOUS

PDF

126.0 KB Created: 2021-06-21 10:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ed31dda5ce804d05fac5698549c4c76e SHA-1: a46045e6d87dde1cb3e1f44cb14dd9d2a8561896 SHA-256: 5b8a015c072620dc2d6ab9d991f66f7589c026736904d225e56fb96b7ccd4fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress upload directories. The document body contains decoy text related to 'Boku no hero academia season 3 episodes' to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/34b996c0af2ce5c9f175adae21986a0f/nejedafanuresedefin.pdf In PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/gamepatusovesum.pdfIn PDF document text
    • http://usateatop.com/_upload/files/siranivisosubugatarepi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e30695161---sigerafisejita.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1ca011cc8e550165df00d9200f1b1e4d/91379573892.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f165ebab2e55917d9e4f02dbc0b069c4/wapilerafeves.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/97972795065.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2800817839---39097166809.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f46c0d33cfefe75397bbcf1fb7864219/60313312062.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/64648cf191c5a7dda2cf0b36977e4a21/53301868123.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/28453297277.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf828e1c9c---31097000968.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7f7e3a6f28f014ac3b7220a71afed3ad/polozetudumikelufatubote.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076575eaec52---damujas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=boku+no+hero+academia+season+3+episodesPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011d21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D21 35444 bytes
SHA-256: 6188685773af91e3c71bd52e949f252f87f687cd5b48c7cc8bda784981480175
font_01_sfnt_off00018bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB3 5560 bytes
SHA-256: fb95531ac4557c429409d8f4abc752bcf48b4796c9afc0902b8d0598aa73b185
font_02_sfnt_off00019e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E64 2744 bytes
SHA-256: c58734b7c43f876d00250fe79027c28030c899bcb97b97a165465ed91b27eb93
font_03_sfnt_off0001aa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA0E 12612 bytes
SHA-256: 128a9bc0f8273950ed2bebcf260c2372154d979df10ae609c0f01a079c1275f8
font_04_sfnt_off0001d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D311 16616 bytes
SHA-256: 7ab81ce3d92a9ec80982bbbf7df4378fdf9290867a146be245f32411f9d17586

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