Malicious PDF — malware analysis report

Static analysis result for SHA-256 8baf318e1b6ceeef…

MALICIOUS

PDF

76.5 KB Created: 2021-05-30 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50cb87aee3c7cb9b70079ade64d6def4 SHA-1: 0546bd802fb548b28e891b2efad4d4871d0e517e SHA-256: 8baf318e1b6ceeef11f8fd911550cebdf7699b35ba02cff649410fc99fa01ba4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, disguised as a movie download. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous URLs hosted on compromised CMS uploads suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1bb8b35d9---70942378.pdf
    • https://davaocarrental.com/images/file/nujobiwew.pdf
    • http://champaigncursillo.com/userfiles/file/sewemobetaxupuxoma.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a37e1cc97---tivitaj.pdf
    • http://bannails.com/fckeditor_userfiles/file/gewumabovevapepewuwi.pdf
    • https://euroroma-bg.org/files/file/woxidakinipela.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a571bb50b0---16042837931.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad40a6d727d---domodudatanuwezafiwuwigub.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f52196fd15155d628a72dd994302d950/25492149403.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01a22bf9c---ditida.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622a86279b---16283873819.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ca5a202d---mazepexawik.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5c7fbfbffd249afa45282aed06edc8c0/zubanitonebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hacksaw+ridge+full+movie+tamil+dubbed+free+download
    • 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://scripts.sil.org/OFL
    • 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_off0000d550.bin
f7644b9b84bfb294617f796e742cee2513473efae60103370a0cfd3d55653a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 5656 bytes
font_01_sfnt_off0000e894.bin
ccad006322eb9d5f9b7d3a0dd0fae7f7f1159555b7be973b5fe21e34b92d9bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 11376 bytes
font_02_sfnt_off00010f31.bin
e21d3e86eb38c05e21807c3e95a407860dd11724e9ee9fecdac3ffe0f05349ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 16240 bytes

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