Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b4c24142f57aa3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 20:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe73d7dfca8f796ac2569ce7102e14cb SHA-1: b4348b1b72cce4fe84091c6b5b7d2cb707ad5790 SHA-256: a8b4c24142f57aa3a9837852f0ebcb0ea4aadaf05dd30ef2d57f9ad1762592f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=phonegap+create+project PDF link annotation
    • http://copy2d.com/ftp/image/file/kuzoku.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/tatukufowizobudol.pdfIn PDF document text
    • http://355353.ru/userfiles/file/67647106347.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/gojebimonunitijaselarug.pdfIn PDF document text
    • http://innotack.com/userfiles/file/90547900377.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/bixor.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/delimofogudoxinepi.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/galepululifelovan.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/belowapewumaweki.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/4837695576.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161445f8313abf---60203802217.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zujasazomadilesupo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/zanedopotozogokulinom.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zisigarozitazis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318628beba9---73047582166.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/25974664506.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/jusezejejiguzujivawafu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5c21c02702942599daa5d118a8a55548/farorakivozegepez.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614c41d1650a9---33164539259.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/5516096306.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pamanizazisuza.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/lamarexogut.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_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 10480 bytes
SHA-256: 6dc5c30ddfccba6a12101bca6b8f7fdea9b0a036fa0ee259124f7bc61631e0d2
font_02_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 18008 bytes
SHA-256: 9a9713dd94a55e3dae56571377482f8a0b78d6f14ce5af900bbf5fe097423f36

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