Malicious PDF — malware analysis report

Static analysis result for SHA-256 768946cf2dd25fc8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 13:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6aeaf6bccb35943dd96371ffc5acaa0 SHA-1: 57ec4dda97b46c499e37ebbebcf6edcffa4d092b SHA-256: 768946cf2dd25fc8bf0acdcda3d0191b2fe52a5cf9dc7bfdcd637595ee99a373
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-only presentation with embedded links designed to redirect users to potentially malicious websites. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS upload directories or disposable domains, strongly suggests an intent to distribute malware or phish for credentials. The ClamAV detection and ML classifier further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=private+servers+hacking+using+freefinder+apk PDF link annotation
    • http://myslizdrave.com/soubory/15692369504.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/063suostn5gdgtihtf59pd4hkl/62677400219.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/texukolozakurufizos.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/37838899615.pdfIn PDF document text
    • https://architektor.ru/uploads/file/bekukevagapaxerozofanofo.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210919_1BF33681DC88C6FB.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/18065763717.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/bagoxonopobelekajajilara.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nidabopisozu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/rujarirogejekivibazegemes.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/10598704795.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/16368827939.pdfIn PDF document text
    • https://robertbah.si/files/file/30570824661.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/62594091328.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dq2nqb3c6707kf368r06mc3iq4/kegazelowolapiravexejufar.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/lidosige.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/lolutawowirojibemesefa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96brksonjmk85nfgqosep9kjg1/14549987696.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/82620565087.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/lemafedijodasojapumujom.pdfIn PDF document text
    • http://ed-union05.ru/files/file/81286620163.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/28693047077.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210902/16305487566854.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_off0000ae48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE48 13712 bytes
SHA-256: 1fa66380c158716ca577a00b057831d6ce1cd657fd3c8bcd358a43e5b90280cf
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10992 bytes
SHA-256: ad243f6d82667864b1e959cdbdc3bd5623f7e9e763ada483b40c17f20a871d97

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