Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ee4d2e4fc28726…

MALICIOUS

PDF

93.5 KB Created: 2021-07-15 23:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be5518d748daf39571399aacac9ae58b SHA-1: d8e7fa0727401ae52bfe54ff9ab628801033904d SHA-256: 10ee4d2e4fc28726bf86f04010708607d5b2eadd3b9695ce954e9ac0d6f369f9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and the compromised CMS upload links strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de72438fb23---xejigimaravesinawilus.pdf In PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/tinovozojufijonuva.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/85804879425.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/84d28650aa55d49850be66da5b5a4954/39200160438.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tuladejuvagaxeg.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6lbujpfoum6srqn68r4r2e0a75/29353766661.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qgle1q3602o8r6cuta9r07dnp5/dokepewesupara.pdfIn PDF document text
    • https://koratspring.com/upload/file/45486344512.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/remoko.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c10146de833---49705409923.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/rowuxaxovosak.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/85ohroh41j39d97o5riisfjj7o/perupebelebaxo.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/zirinefakewig.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0e64a203566886568b1ddcc26848f3e2/8470158563.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/12a3ba909962c60eb7b7f676a225710c/xubifot.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/2551943751.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/65d9ce1ee79630dee6a07f7a2e3a3310/futoxamuveworofakoju.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/ruvejatuludevikogake.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/gojarumomarusixari.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8371e85d1f6d0e763cb3ceb4796abf44/52279502206.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/27056125920.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3hurkj7r5l9l9sf5sdb47mofe5/45827986946.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/47b7a3a68c353198e685263df2381863/18662708101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=baked+puff+puffPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10008 bytes
SHA-256: 0dde36926ca5b4a35b7bebe2c1cf8eb964b15b18c821201f61f3f099d3d00bc3
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 1824 bytes
SHA-256: 065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
font_03_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 17924 bytes
SHA-256: 2981fe00e591eeae0d8eedbbfe18597ec8fd035bf823a778ab651f10be724080
font_04_sfnt_off00015006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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