Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2578e870a230fe3…

MALICIOUS

PDF

94.0 KB Created: 2021-09-20 22:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a23a282e91457dbb910a6d6e634284ec SHA-1: ae03cc47e9deff5a6149b9104373accc42f8d543 SHA-256: d2578e870a230fe349c4f4efb142e148a4356de8a02d8f28d250e6e005f1eb59
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://locktactyuma.com/ckfinder/userfiles/files/suserojufu.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c4327b0---kusumekopidofajuw.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/vebasinibakowutederogo.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a6de1ef0---92621050107.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/weranarezukokedox.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/gavivotijotiwavolanusase.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/zegolu.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/rifomufukot.pdfIn PDF document text
    • https://telenovella-bg.com/files/59917687596.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/xumojonidigoketefamivora.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/43846241692.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/sutomegoj.pdfIn PDF document text
    • http://only-svet.ru/upload/files/14045975226.pdfIn PDF document text
    • http://vning.net/filespath/files/20210916134915.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/60259082145.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/lupiladituxaginexeruler.pdfIn PDF document text
    • http://warehousetraining.ie/images/busenetedema.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fegovepopefajokunudovoz.pdfIn PDF document text
    • http://schokofontaenen.de/idata/defiwuzafuzajukopa.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/mufudigijetoruz.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/29222853020.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95f9a1951---56596491151.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/21746275835.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/wigizedapo.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091315093373499.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161343f63ce81b---33692336134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+design+of+everyday+things+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_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 10876 bytes
SHA-256: a84ba197392bb52b316f44a2c9c1fc682ccd974895d9d6d55bbadda573b79299
font_01_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 18800 bytes
SHA-256: eb62c0f665ee8c02148e2d8fc3cff0eec8dde07d5cf8c99957ac17a970e00c4d
font_02_sfnt_off00015209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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