Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f1bd98def7609…

MALICIOUS

PDF

92.2 KB Created: 2021-06-29 07:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 756a26ecc824a4811883a0fb451cdbd6 SHA-1: 19c88a946130b49fbe8b107b73f2195455d39d69 SHA-256: a80f1bd98def7609a82c3b0a6d36556abd7aa00c1d8df1b22ac51ecbe55a7a2d
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, likely to bypass macro restrictions and download a second-stage payload. The document also contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pendekaremas.com/contents//files/jajugapexegiwibo.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f9f53fc3373e0c160800ec0d92c79fe0/paneleluloki.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/oa9qkd236f5l42sn63mo8ia6i1/39738492319.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/08f259d3cb77a4da2872a0476a7b88c0/bevosurasinuju.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dinuzezomojoloz.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/91734720272.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a131c1e8a226d3e3e1510594010884ed/ferixo.pdfIn PDF document text
    • http://royalgroup.at/tmp/besit.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9cea3e5f---63468083019.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6752325d13---76517705815.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/92854618752.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/fajakukubomotutijatot.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kuzagojerimubojapobofus.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cad884eb8---75042524161.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f798293a6f---kepazaxotuxadodazu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/aaa7cc30cd8cde32158daac35665b985/82820075759.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ea30adf3---xopenuruveva.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8ec7f1208b3b0ee0e55ae4c1adfafa58/valeresego.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wurab.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fd3963d60b5c9f4f2cf38a1c7e84b3b6/4454167464.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/18f58a3a227ed350a5ddeac52b8f9fce/kabiporeliwaxoxuxej.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3614496b9---6009923260.pdfIn PDF document text
    • http://blatt-gruen.ch/files/dovuvo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb009a0f40---komako.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ht7585ic1s5236459ie940p540/85003545460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=java+edition+for+freePDF 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_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 17680 bytes
SHA-256: a3598fbccd25aa66fd21d395a886974173d981e7cff655cac77a6cb911ab125a
font_01_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA9 10188 bytes
SHA-256: f4f583eee340764784363f0e3e6aefefda07b7377b7ae9ff77ae288c27b05b85

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