Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ed9109252897d8…

MALICIOUS

PDF

122.8 KB Created: 2021-07-02 08:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65257e3a5312da19120325ee1dd938c3 SHA-1: af144ec369b01ae2ad335b43c3bba2b281ea83d5 SHA-256: 18ed9109252897d85834c210db5490e9be89f7ef9511ff3419dffee9ec49a04c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50c40f552---lowigibote.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a992e388699---soduv.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/fedazaxokewimidomedufiz.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/85759065447.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11f716bc6---zufarixigaxoj.pdfIn PDF document text
    • https://hiroyoung.com/data/files/59539856752.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0b3cb0cd0b277188286c52f0f7ed41eb/resupipakaparirimuxikif.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6ba2fd10---vepesojedakewana.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d8bd0c2056d85489a3a918674ea24683/93772337941.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/aacaaaf7745596aaf37fdbcb8d59f9cf/walurige.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/31820287368.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/28441820199.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/81cee3c655e08c70902f4dfc033fcc94/mereru.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada531c2677---tutujavemi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/76013425136.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/250ad35defacb8f6305bed581ae6c3a6/82143124237.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ropejafebozenojikanego.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ed5bc3b8---8908374597.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/lotiruwoketekenol.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160831996390eb---30497673809.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2afd569b---talub.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/xuneravawuzoteneri.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996767060a4---sabirakibaragigumanafebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=goof+up+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 26832 bytes
SHA-256: 47d2ee34d12686dab10ce18f73880cdfb3ab2f87acdb5101471bc5721fa6c48b
font_01_sfnt_off0001849f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1849F 10572 bytes
SHA-256: 4e5d378c11cb577c3651fa1877dcd2aa85b7337ed936134aa5ed11e98f4e5ebe
font_02_sfnt_off00019cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D4 18312 bytes
SHA-256: b11484fd0389a875f55b13d4269d287e45ef3e6c57adad2d05fc2c71490050e5
font_04_sfnt_off0001d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0A3 3184 bytes
SHA-256: 55824c30ecac4501a4ff8e41192d1cce0c0de97fdb3dd4c3d7e96ec4a9980ed9

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