Malicious PDF — malware analysis report

Static analysis result for SHA-256 436ee30aeafc2e43…

MALICIOUS

PDF

111.9 KB Created: 2021-08-21 12:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3e48e6325430547951dbc646ff46843 SHA-1: 4bece6b3c2291bde80c2b58b7c394efa22778206 SHA-256: 436ee30aeafc2e43b14535caed4e871c429544d158b10ff0b5e90e775a60ccd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=the+dying+god+the+hidden+history+of+western+civilization+pdf PDF link annotation
    • http://alrabbancapital.com/file/files/runifoxikimulo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/depigiki.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a98fa8e1921dee5e51044b3c4b51171c/fibolotikufizu.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/zurulanurujurodepafuvet.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aba148d1---81370937544.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e8eadeee8---majosomusumuzibimoxut.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/43034858209.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/8838295988.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/59578274970.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160751f95ccd77---66128751032.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vasab22nejq15upjfhjfdc68h7/bijasokutovozunoxezepu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/da08e9fd2b4a9956302a54d9cc16ee0f/26717140834.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3d0dd603ad98182b2567dcb308918eff/takobosobevivavitin.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6aba1e331f65a2e56425c04974742299/19553638890.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc112203a5---54676913149.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075989256445---22916583934.pdfIn PDF document text
    • https://abeess.com/userfiles/file/nekutituvazorug.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/30430442411.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868db2cd323---vogoludamedizak.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/betuxevumelimagoxajor.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def044db3b1---43468939930.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6f0827ef9ac891e0389f83abc3773eb2/pixatibojijabexedapete.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vogokupewenuzo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1ab81a6bc---zijobujisiwezib.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/af5965c3258e5fb6aa01242ef2d5b1df/remabidatudujuroke.pdfIn PDF document text
    • 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_off000146f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F7 21772 bytes
SHA-256: db982817799874c018883f951b01c99aec9d363c2e68a6db55e9ee30eee438fb
font_01_sfnt_off00017c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194B0 11188 bytes
SHA-256: d3fbe4b8a7b584b78120fb1451c6c32adfd1ab8bf31963c1c409d2a0d5701201

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