Malicious PDF — malware analysis report

Static analysis result for SHA-256 205a88375dd20513…

MALICIOUS

PDF

87.4 KB Created: 2021-09-13 15:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c284ef0b92a2af799a49297efb377788 SHA-1: 7a58773b447b16c01d6209d931a5961ee6019691 SHA-256: 205a88375dd20513854c827255633400a9e2b284bfcaca03a3d9687414549942
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://pvvc.cz/files/tavukefapuw.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04150398---17437794362.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lapapitej.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/juxukixokoguminalemami.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d2d136058582c08e9ec25e57cab759b/kavuxemimab.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/95500315501.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/mijupepasavato.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xefiliribimiwavibanan.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd461a2c7---jogajopivebagamej.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d4bce0c631d1bdeaf65d589d1bcd7fa8/39322256275.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/39851850583.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b64b17431---3795377224.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/miguwazezez.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/64154172595.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84b9813b7---7079448493.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41123e143---kulonokezuki.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rimovipabaguzelefivogekak.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/vawodajudororen.pdfIn PDF document text
    • https://phnews.ro/files/file/mexevajamebozeje.pdfIn PDF document text
    • http://petrduchek.com/files/mixajigogoxu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f270def34---28061562913.pdfIn PDF document text
    • https://allianztc.ro/files/file/75009231854.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/95697191202.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/wimimemarotekizuti.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a52fdb03b---zemedotuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tyranids+8th+edition+codex+pdfPDF 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_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 11056 bytes
SHA-256: 0d4ee255b28860c30a4c6ef74401142f13e56691e1ef53cae9f2c8f8d7dac397
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 18860 bytes
SHA-256: a0ccaeb86d397bf458fa0a8b3605c02ae0c13f508e3fd69ea063be10eaefd7c2

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