Malicious PDF — malware analysis report

Static analysis result for SHA-256 def836097be76814…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 04:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53b85466a1f6a9790441071b37dc55f2 SHA-1: cc875f9830b50945d4737c67bfe15a47e662eafc SHA-256: def836097be768148b40eab796c5e7e0f926cb0e6abd7519bc458882d40fc744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=pokemon+fire+red+apk PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a3dd2fc90422cf2280181e2a98aa5f6f/rezibupakesuju.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96439395952.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/vazaleguwifaxemazitif.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/90968453539.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631056302.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/pelexukiliforob.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/padezesux.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/luwukidizawirawuvoxitaxo.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142afaab86fa---38524741549.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/nigojijewavamafutizanad.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/21742178343.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/44917267123.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613269eb348ad---76532642822.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/31455416086.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/sudidofarewigejiwix.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/kuwavij.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/sewixujowenifujix.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/66862699106.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/kuxubusoxubuwuzobuvuli.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/loforexo.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/92011397827.pdfIn PDF document text
    • 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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 10440 bytes
SHA-256: 669e6993d86d2aa7a9ba16ca754279a0727b0f3317ac0cfa2b16c1488674adb0
font_02_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 16768 bytes
SHA-256: ff295bed1947b4060200e62eed10e97fc2dfdb477efd00a87d73bfd273211a4e

Open this report in the interactive analyzer, or submit your own file for analysis.