Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f950866192b9e2f…

MALICIOUS

PDF

93.6 KB Created: 2021-07-14 01:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92231d75e172096decee4a48f24bd41f SHA-1: d7d825c98793a7891efa998dc28b8f472066286c SHA-256: 1f950866192b9e2f0b748c32d53e02eb8c5922471d08caed27c9ed6115a08a59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160708d8e907d0---lojifetofubudegobej.pdf In PDF document text
    • http://bundoreh.com/fckeditor/files/file/98543182757.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/17d486edb23ac648ca26421ee89e31ad/12608138775.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2f33feb61ab6e1c10d4390cdfdc47f0c/29911872566.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480fc2c94d---vivovenudonirevelo.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/53544817115.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/peteletosarupujawopoto.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ce79508469f---99574732018.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2c719ab4ac1fe46a42330df9db291336/62756240199.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f419e80c2abd570d60ce011595b2b931/42204473654.pdfIn PDF document text
    • https://0900107678.com/upload/file/ferigi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kc5fj96ssrnqjm8a3c8nht3t9g/wunowimigew.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/48957089310.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/69162794748.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/nezos.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc440e5c---28339326869.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7a12791b---28132211920.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/52435636259.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0bf2aea8016fb36174bc256e2deebcb6/72810764900.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/578df8301b212259f0b2e291d4e8fe33/46843294672.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc53b65e6d---79571457375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=space+and+learning+herman+hertzberger+pdfPDF 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_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 17436 bytes
SHA-256: 1d61f10f5420e08116fddce5d8a6c6a19421e0aba05be3e7dc0864175c68a3d7
font_01_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 11052 bytes
SHA-256: 2a91acf589242cd91f0f818cd88d226e0eb780d706f836fe95889ae68977501c
font_02_sfnt_off000150f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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