Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c998ff5da06c5e1…

MALICIOUS

PDF

91.0 KB Created: 2021-09-18 14:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1db53d7c1b8d672bcb95b55a45c7e94 SHA-1: 6902c3c80205349f042fafe383eee494efa60aa0 SHA-256: 2c998ff5da06c5e146111573ac96928ce7de7756a77c40095e22236ef2be458b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b8f769d4a73ec532509d3134c9f70bf5/46349525079.pdf In PDF document text
    • http://www.extramas.com/userfiles/files/59180286580.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/47139422141.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/11380915359.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/49757408612.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2a388bca---68229847996.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/47648448071.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fuvok.pdfIn PDF document text
    • https://kawanmto.net/contents/files/7982770310.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f9ibv88hf38kja1124ltf79rre/kaliroxuxezowojikekog.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wadofizaz.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40460547119.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/roriragegobalasemadozaz.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/babanupitiguzomu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/76416141814.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nisupirumesukujewika.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/tunaputosadagasusubajez.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5812ef5f2fdad3fbc80ae5e497c9a198/81779253591.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/pukenokijadobad.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/66963828093.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/bebiliripemaravikudidilu.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/rusukalepodukujiz.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/tamanisejuzavules.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bejakugulapatefeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=my+hero+academia+2+moviePDF 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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 21264 bytes
SHA-256: 1e3dbf3224748623ff2be2193a6e3df93d6273d26ab892d398e04742ba22cbd1
font_02_sfnt_off000146a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 10512 bytes
SHA-256: 67fc87f1be8fcf6f5ba4ab1afb3f3505e81f997cf209dc8fed5f0ca2689f7845

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