Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631d5c55c9cae88…

MALICIOUS

PDF

100.1 KB Created: 2021-07-19 21:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b65d8e8c9fde3940031fd36bf70e1a6b SHA-1: cebac5f7f2a604c0d43f65dc023a24d99658ec43 SHA-256: 6631d5c55c9cae881315ed03678145cdeba751c8a9f0baffeb3615238d5a1fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves as a lure to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51aac4a21c5554e1937fc14e387ce2fb/13998567219.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf6b26b18---86454758690.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609833a1ac250---81619183142.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbc50960fc---39506919889.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/4sg4ji7c9i3gi27f7lh222rvv5/mitamaponakipigam.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4d26f4e4---41226874709.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zoxem.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db2b116ff14---gunovaxumunumitagejarar.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/99310194734.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/lefupawokuxobipug.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21071414522526120907o4bs.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99e08a0f922f8c1f3e53ef160437ca86/88373402683.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gososesave.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/h2plkbc65dash1d8o6uvjvpsv4/jufolom.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa0ac5e38---64556409090.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/aa245990b84c6f44c7de441de3a7ac55/40415840800.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb59de1dae---feratenubilonik.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce459e2f2---niwopujedasudav.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/og8oe6kld6mmtcti518pjdre0q/roteve.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0444f8b4---keluvosijabupokivavejono.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1399598a1---25752678453.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a114d27931c---40009255998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=things+that+start+with+vPDF 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_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 17600 bytes
SHA-256: 2a4ef9a5549823cf440ad6b4b4e10a22fa5fe95b4e69834d075ab45d111b1f8d
font_02_sfnt_off00016b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B36 10204 bytes
SHA-256: 7ecf90e95f54292ab89215f8434761315c20988a64264bf85f79950c1fc6e588

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