Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46de3d7e3a428a9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 00:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79d45cc350f6f7289ee831c9cd8bd8f8 SHA-1: e4d1ff4112dc3a2687a483bd4425c7e12b60df49 SHA-256: d46de3d7e3a428a98081f11137ec0fb0b0ef7e7d84e0377dd1185b20b401a573
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and presents a social-engineering lure to install a browser extension or update. This is a common technique to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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 http://canadianrockies.info/files/file/1323762.pdf In PDF document text
    • http://chronocertif.com/userfiles/file/zozuzosazijabimaz.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210913202239_MTk3MzU4NzYzMzY=.pdfIn PDF document text
    • http://pi-consulting.ch/download/mojinoxo.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/24561582105.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/44159216589.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/sosavaliwob.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/digufamokigakuko.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/fowam.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/27441537690.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/40098985072.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613503bb29ada---20956898425.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614110a0f0f37---wimupajozitotasamowiwa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/99d16c01b44e6cc4ee22eb6816f75259/gabalogunetafowubafudunij.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/15510832083.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/34611811560.pdfIn PDF document text
    • https://tekartltd.com/upload/files/nifelimenujona.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7667790b---28674337266.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/wumivo.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/gobavago.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/demosanoxumeju.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/muvaw.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/mamakikebudiz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d5abf3a5---66699926323.pdfIn PDF document text
    • http://dakmet.pl/upload/jarozoxeviwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+chrome+tab+groups+disablePDF 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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 11184 bytes
SHA-256: a69fa606661c3cb987f872023120fcc5c429e8acfe7358aaf67f1850cb674ff9
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 18020 bytes
SHA-256: 70be64864e4f7493dee6b3b65e933da7892730e40d817c69a10f2d815c4c24f2
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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