Malicious PDF — malware analysis report

Static analysis result for SHA-256 544464226d332cb3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 13:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a7aed422a716c02dfcd5f66fab507ea SHA-1: 5ed3646aaa26a8f13bc7ee4cb32631ab7be91655 SHA-256: 544464226d332cb3d1e59399cfb01aeb690d83de37b08e2fa1183ca3d5025021
196 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a remote-support tool lure. It contains numerous links to external PDF files hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or exploit kits. The presence of embedded URLs and the overall structure indicate a phishing or social engineering attempt to trick the user into downloading and executing further payloads or granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2bdb67b598ed8bd61c1dd2e89063ee02/rojelotefoxekeku.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/080057fea343d1f7b8154200171a79b4/59315967743.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/lekujelixuwaz.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5e87d11e---96326443797.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/35743968611.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/motumop.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/4979399178.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bb58aldlaodd2fv5q91flhlfb4/51042597510.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/71801321540.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/16611025240.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074493b2ad12---sexoni.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/bigamudifu.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/repujorotera.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea9405b1f9---gemivatupena.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b2c028f84766e39a615e1729f2070793/92656992709.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5a696b26af7697a51a54cd44709834db/mixegufiw.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/jowaxavidogesoxu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/43c5d93497aed62e4438e43b22b1ad72/73465411825.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/janolefor.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/66408849421.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/tumidenigiro.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/85813036151.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/424e390fb1f77f7a494e4525c26fa3ee/56967404755.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/70733736560.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160acaecc710d0---62001106882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=espresso+english+grammar+level+3+pdfPDF 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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 11068 bytes
SHA-256: 713a68741c6e6dbbfa75306f6e6bab08b1478b8c158ac06f8af432cfa46cf600
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 18812 bytes
SHA-256: 7ad860b9e0d6dd080e2f0816e8f52f520689b77231bbdb70fed4c221ac9cdaac
font_02_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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