Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d3da5a07be41d5…

MALICIOUS

PDF

103.3 KB Created: 2021-06-30 12:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 079f1b2c05fcc5c15ff67f3ea290bbcd SHA-1: 24134686acc52095c478ea28420cd1998cbb0b4f SHA-256: d9d3da5a07be41d503952a3e99285db6a4a1a17791f5d9c97fe22485ca8c488d
276 Risk Score

Malware Insights

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

This PDF document exhibits multiple social engineering lures, including instructions to disable security software and install a browser extension, which are common tactics for malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm pointing to compromised WordPress sites suggests an attempt to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 9

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/fc21f455ee59e7bf31283bd2cfc500a4/wefodaxaked.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b03b8916---85496079011.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052111344710.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7ae1db326928f00d413c06e91abe8ca8/jeligovibabubux.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/557678dcfd77d0c3b50bbe9c0a21e7ba/20482256089.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add75676c28---dipenugezotagizagaxunam.pdfIn PDF document text
    • https://go2germany.ru/files/file/sitawivozuw.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/24108073108.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gebofovenipomexulepugut.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/niwonezudulabus.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/46586157716.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c221bc698---zipinivuxewugaparaxifimaj.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xenobukivixilusadakoxu.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/98517801390.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/dikazobasubujevivixari.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5819879f---28559782464.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4dad04a94---69017552528.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/finumoxiwarevipuje.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1a11a15b---nedoviwutakorafaxanamosa.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/91484857051.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb18fd0d063---nuxowelapuxupozinipoxu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da22d4ba4c9---ketejogiwewerotiripel.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606efef14e4d8---jimawoditusus.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/fogomudabuxumowiboli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=twitch+buffering+with+good+internetPDF 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_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 10668 bytes
SHA-256: 9b8e2006180e6ade20452b38aa8f5898bf73a72789436dbadac69534f306fba3
font_01_sfnt_off00014964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16176 17788 bytes
SHA-256: 3c0eb2ecf4f97f891f64ec930f7ac10de8b63963cf923eb0857aefaa70560eb2

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