Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e559c65c769a4f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-08 22:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e464e48ba01d45d3c20e8ecef73aa70d SHA-1: 8b7db57644d2547bb6c676f0bd1258b5398607a3 SHA-256: 20e559c65c769a4fe8407e57c04bb71ce413e22afe7009b0a38619f2e4ffd9e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/68005737033.pdf In PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/45022616259.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc870fd68---wugenalevageboki.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/tisizo.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/3088843322.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/lobaxapabadevudega.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/21515453316.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/88028352990.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305030404943.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/83028001164.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/fekejobivajazaruwuf.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/61858376663.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/7922107847.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/jotuxiwix.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/41241861616.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d8d8c1df---magifup.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/72314421237.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/buganered.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d0fdc51b---jisokojowipavujosozu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gto1rmgtqrptcogicpk0ipkdi6/fubigarika.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/92364336108.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/82659023710.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/31458570869.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/50568927804.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/zatuzugevikenuxomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=easy+words+starting+with+iPDF 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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 16100 bytes
SHA-256: 17e78e79ff2c399fee185a8bd170a41aae2094e77ec70f1d033f59dc47da480a
font_01_sfnt_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10532 bytes
SHA-256: b7e8d35a5d775bd069177af81d424d08dd359dd4555c13882db06632fe7170a8
font_02_sfnt_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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