Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca196e509ce6fa00…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 03:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a7623b861e16e1e624269615833762f SHA-1: ce32d5370f420da4e2be1fe3f9b3c62e69925786 SHA-256: ca196e509ce6fa00d23ddc6dc3a5eff75412d95006d8bea8e14617dcffc68c8e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links, many of which point to other PDFs hosted on compromised websites. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. The ClamAV detection confirms this file is recognized as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vinaconexmec.vn/uploads/news_file/satetotiwenobiga.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160703ee5013b1---lipokonomis.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/serizipetisesadibevulogu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/15rr44echedp1rqj4qrgb6ciqk/16137619315.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/zunotafawivirukuriju.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/30724655878.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d325e93dd5---96777950084.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/67769761581.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed993b20b06---zorajapu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/natcdc7ilftbi216egr5q84iol/21078583050.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94471297303.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/29285241466.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/98707057887.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/9819143127.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd982355ac---43840098323.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/omfqug5qkj9r4omvubhvj83tpj/59716588429.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/xufituf.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/957097f331a479f6ddd57f61f072acf2/57768895311.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/guzipa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a4e77e258---kagig.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/839b8737c5947b6932bccfbc6d68e552/55301309855.pdfIn PDF document text
    • https://kristinanamaste.eu/files/5599875601.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16246567758943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=convert+odt+document+to+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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 10508 bytes
SHA-256: 25b5ce6d5edfb3eb8131b92b55065e0581c80c1293f6829a626d18895dce9fe9
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 16132 bytes
SHA-256: f5ce3756da98afb23551a5297b6b0ed2d7b1333bd18759e9862a9e947c9b549d

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