Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae8704fc7bc7991…

MALICIOUS

PDF

99.6 KB Created: 2021-09-01 03:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be52ebde548c117c10788807e7563714 SHA-1: ae09983e2b17938f02bcbdb8f35f7c75180b9d5c SHA-256: 4ae8704fc7bc7991d7bf9da34ff05f6a95d44df04aa56f6fdb42f866fde7df5a
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 sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5f95dc8d---titonumafipusagivarati.pdf In PDF document text
    • https://pro-biomed.com/admin/userfiles/file/92245722132.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c31c4b6a---69939429301.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607936d959db3---masozodosamotubok.pdfIn PDF document text
    • https://unitjaya.com/contents//files/minesivurapi.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/muvukefikutimo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/wozowanabirukejit.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c72dae9410d---wowujudovesexagar.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70984a9439320dc13f0cf03272ffa2e0/9029666243.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fokexetelifesonegefapo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654b3b4af8---28588675068.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/vikotosuwowopuvirerir.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/6744777188.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/rokiboto.pdfIn PDF document text
    • https://inks.bg/userfiles/file/lunivit.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a925874a927---27470020289.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8b40784ee---40259329150.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/de44c70802ba43ba45627ce7c409536c/45158210610.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/15470058188.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/palowizokavededako.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4d7fa5eeb45b34737b221f4d6726dd2c/39933328650.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f04fbd6be21---13104266373.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xexixago.pdfIn PDF document text
    • http://signauction.net/userfiles/file/14102968954.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a330cde3e4b---wovuwuvalefaratogitorameb.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/banexatopapegifuranazedix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=schofield+and+sims+answers+onlinePDF 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_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 18204 bytes
SHA-256: a91e7f1e71c1642994eb45c8d5707e54007e51ef7bf281ce1e419c76b35c009b
font_01_sfnt_off00014e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668A 10804 bytes
SHA-256: 5d828de94b2f2f8efe73708f403b0b40f9f147f09751d9a7bf6f83c1bf9bb6f2

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