Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfd78a4e0924f4e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfec66b538f988bcec392075270978d4 SHA-1: 1adf92d97847c5116f866178e56bc4eb0aeccec6 SHA-256: dcfd78a4e0924f4ee649cacbc421c79222ed13e63db1c59dd19fa2476d280e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely as part of a phishing or malware distribution campaign. The presence of external URIs and a link farm on disposable hosting suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=parabolas+in+real+life PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb7aaa9ee---wisuxunibexejugog.pdfIn PDF document text
    • https://hagepoorter.be/files/files/bexogazadub.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abee25bfdc7---fagogu.pdfIn PDF document text
    • http://techbis.pl/files/file/15242684539.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc069c8267---nutebelutawototelemaz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/48f5ea32592575f05497ccfb9173fff4/xufoloxobota.pdfIn PDF document text
    • http://blueyee.com/upload/file/280034172138.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/25487439599.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ucdj0cvi7uj13sqflq1fqef6bi/xipivirepuzen.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cd4449dfaad63b71dbf48858f18cd5c5/dagukopazuwibidez.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab3850fbb---30005522156.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e1c27824---rasubomawonomaruxomod.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/49081702249.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vei1peeafjnun38o4gm5mjl9ml/fetetitibobogejejefo.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/buduzigitabutorujowupoda.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/80039476358.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/14482046074.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/nibixonerugugaxepasevita.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a09f7dadfd521910f7864b7dcd52ace6/73966230677.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba7c3e1fa---xubik.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sofasevozonugasesadalifer.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9141af44---59032783406.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e626e578b2f35d582b6f2f0d724727c5/linuxenujomuviw.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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 17976 bytes
SHA-256: f9fb7709981f9f9244000e608138944648b5100059632cf763a0efde614e1b28
font_02_sfnt_off00014594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14594 10248 bytes
SHA-256: c35eb67ca55c622499a5a8626e9121e08792c9c17a5a8141e56181843dd5f563

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