Malicious PDF — malware analysis report

Static analysis result for SHA-256 4547f8073af5563d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 21:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d6947552e9e5fc4be33909ea30eb690 SHA-1: fcc4c7b54c29e3bb96da93216e155d216f2c2569 SHA-256: 4547f8073af5563d2aa2000205937f9fb9468ce755987a68fe95ebc9702867b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://macjiboter.macjahisa.si/files/file/54817708973.pdf In PDF document text
    • https://tttinox.com/upload/userfiles/files/22844959751.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/22353436619.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109132054407858.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48910961602.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/84558979741.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/sanawivow.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/nulilifojotu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394b62e63a---merisuzedobezuf.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/92312871831.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/73443661508.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/jilobexebagugoka.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/32873835179.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/40094137486.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kikij.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210916200615_mt1rxz.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sixavavil.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaa34252c---samegekotupowukowatub.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ee3b9909---17187553510.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/limufop.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/kevuwasogobakurudizufim.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/57341910258.pdfIn PDF document text
    • http://capital96.com/userfiles/file/78346883149.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/44351581037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+client+minecraft+bedrockPDF 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_off0000b3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 15632 bytes
SHA-256: 52abb4ca11b4def1ab6d7429f167e5fbe394ac58652145a2bfaaba316e538b2e
font_02_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10692 bytes
SHA-256: 5447b60411218757d14ec598c6e8114ab4c37fc1234c3dcd3bfead102fdeea1f

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