Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c9e79e0a4187ec…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 21:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0dc1c720e2cd542ba419ba841aed49e3 SHA-1: f58202d64550b66f9b8972f8b925e8b4385d3554 SHA-256: e5c9e79e0a4187ec4d9f6daafa2fb08e34c2fc5603cbedd33f7f3e5a381d3000
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 CMS upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis confirm the malicious nature.

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 http://halaljones.com/uploads/files/raburofojamoxakugarer.pdf In PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/gisiju.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/rifumipawawapofozi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ii4fbpvu7anaond67hhn2k0gd2/napan.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077888c483a2---48825097490.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c115ebc3447---pipopasadibitu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210513085929.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nluehq0lpvoq8g1usob31brqsn/dudiw.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c425178c7cf---kagupuwiraniwabububuro.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac460565bd8---lemosuzofatuvijiropazed.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e413ce978f---42762939912.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ulq2hlqntkd58tj9n5uq3h6j7e/tataf.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/borifujomoloni.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/neburewujevesidabarego.pdfIn PDF document text
    • https://polandpools.com/contents/files/nafazivazowazinix.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/082dc2c3864e57018b90d4b2e9064e1a/kasofamusivazekivakexak.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gajul.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mulufad.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d6472bbca4794ea49d4bbb0dc12b0490/49483418871.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e08f0501---ketelojelarumojajoguva.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106cbff6fa21---35610288656.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/lenexatopopa.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/aa6f8f0b72b62b9592c321c1b140f321/98502724869.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/vobifodeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hochiki+programmer+manualPDF 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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 17420 bytes
SHA-256: 0400b899bb06763d4f454ec1c54f328bb6e3a71b18429869cd798d6c8ddfde99
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10736 bytes
SHA-256: 0408c95eb06b38ffddab1e79dfb83929006bf6a94a255fb40d66ac8b642eabfd

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