Malicious PDF — malware analysis report

Static analysis result for SHA-256 803dbfbc514c0a2e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 05:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f588fa2c11f02344979b9d495ba957a5 SHA-1: 321704dab07b87de4c3081b1bf56fc7138b46994 SHA-256: 803dbfbc514c0a2ec256a1f79c43cb5fbc70760605fef341879d0f54fc70f848
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URIs, many pointing to compromised WordPress sites and forming a link farm, suggest an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://healthywithhart.com/res/file/gixisojagu.pdf In PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/kuvakexuxotuvujopamono.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a5b6ddeb6811559d4214588c85e1544e/katis.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/fejixozasokavudin.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/190bcee8a80dce790fb196b199d5807a/kifakomizikiso.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/xitebojopujodo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87f8fe4e72df828212295548ec0e7c19/fafarekusefidamaj.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ugpe8fe1btrikv42rvriia0677/30016062770.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2e7df3a4---sogapetugusivijo.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/75953929843.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d8276e5e4e484ed15cafaaf9bdfd8ebc/59631830285.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/58995588925.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/gaxelafazotufenuvubotuduj.pdfIn PDF document text
    • https://turbooto.vn/upload/files/bixofojapifofaxelozo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xebagamomamuwanug.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/c45e2440088778f7aa7a70e9cab3aa8c/degiges.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/58034031163.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wabujugipibeg.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160869dc27a498---fogagobamaxaninupisonaliz.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/36417181467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=8th+grade+science+final+exam+study+guidePDF 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_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 11232 bytes
SHA-256: 3b2d1be611c7120a5787eea1550e5c280e95dad1b475f881a1b578f1de2249d0
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 17592 bytes
SHA-256: bba908e465163d79c3c24f7226dbef3d9a3b7d42a8adba7bec0faf6be71b27b4

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