Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc35d1a2d1f91f2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-12 20:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: baed5ef28d050b23e60e15183acb8ad8 SHA-1: e6a363f4772c32352affa7f93a99c6414e03463b SHA-256: 4fc35d1a2d1f91f2b6a663dad8231666365cff72033df31cde83e4cc8021161d
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and attempts social engineering by instructing the user to disable security software and execute commands, consistent with ClickFix attacks. The embedded URLs likely lead to further malicious content or payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/12a01c27b9a41003609da1ec0909104f/wuwasofipuzute.pdf In PDF document text
    • http://wmc21.com/ckupload/files/wejum.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/mariwaduzarekeru.pdfIn PDF document text
    • https://kawanmto.org/contents//files/zewilazolex.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/63321594377.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11eb77e84---26637512986.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161142c0a1e28b---67485671247.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/lewumovapasulafikasijuz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071606283690.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aa6756798---81695843568.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/75564875583.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sekalapuju.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0ddbcafc---rosefudepewimajoruf.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b65de808c---98925752737.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aebcd563cf3---6950506714.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5137076e01---87205202035.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5477c3cf---7772264803.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e635face5ae---jerinimuzefoxekeki.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/sisojipudobatasujudirejab.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/davimisufebawenifizajijer.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/htn15o06i69gnobla2fa5v0m72/78934279945.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b9635920a7566a848861699cff9c71e/vulirujokibexaxisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+reset+my+logitech+wireless+keyboard+k850PDF 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 11600 bytes
SHA-256: bfe0f3a080d9320f2bdfe2932ef77186cbc12f8924539ae38261e7e09eb07197
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 16924 bytes
SHA-256: 652470237d3d9eca5e59e6050f9b6d0a78fab268690c00e02daff05cdac3aa7a

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