Malicious PDF — malware analysis report

Static analysis result for SHA-256 790ae486bc7f06eb…

MALICIOUS

PDF

99.2 KB Created: 2021-08-27 18:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1fd45c034aba6943b20509b96a93a0c SHA-1: 57db8db6ca0100aabf9dd0a2be0c69cbb155fcde SHA-256: 790ae486bc7f06eb2c61798df4d70dc0733713e31b7515a3e9f65dff14646ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=watch+lotr+extended+edition+free PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca221e9d22---83170027772.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324136a46f---nurabakerazuruzisudape.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/n65eimb5lt7p45qb4p3jephpb5/mexowekikenuto.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/duxujeroxotodenavowe.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08527980b5---kevos.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/68838068508.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/waxofixanutiwubiniwarubi.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/20646586404.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726416e6796---39861542191.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4284cc87---51912804136.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/bekazi.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/bonawulewibo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0335e80f392da1304cb29dff65dd401d/tuwewipidupezedurokizolak.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/fafuvusasutifoboz.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/27275813605.pdfIn PDF document text
    • http://charivne.info/images/file/vobobumokijusexaferezezi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af637902243---fagopefavixexolevujaxip.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/pafiminek.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9545e659ef---98608414559.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/32003604042.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/fesaw.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/88905359698.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gofafomedewipapuvapimo.pdfIn PDF document text
    • 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_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 19544 bytes
SHA-256: 5b60d8a53017541bae5cc1c9ee3a7dc9a8da335c8d0eab8529b09abcfba2287d
font_01_sfnt_off00014f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AD 10500 bytes
SHA-256: fe9b5b2b294d175dfca497a5e250034694cfccfac6ea269efc8fa1073c921d15

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