Malicious PDF — malware analysis report

Static analysis result for SHA-256 13578e264b42725c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 17:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 454258e73ba34453fb8608367732d738 SHA-1: a3473fbf062fe41465db214b6de27bab12189d44 SHA-256: 13578e264b42725ca6c3ab58ef7ceb14ee988e5243364b45b17dcd3ce88fd1ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection or execution of further malicious content. The numerous URLs suggest an attempt to obscure the final destination or distribute payloads across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grandrosso.com/js/upload/files/denumojogepe.pdf In PDF document text
    • http://sns.hu/_user/file/16535091080.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/regugirifoxujodirupoz.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/38600203083.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/95668825656.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/vekoxudodafexorelojebeta.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/jubano.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130999e395bb---tafijumaxokikamexifupob.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wijiro.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8cc1a5a9---3633832059.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/butip.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/bulapuxejomekepapobexelej.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/68992500156.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613274eb043f2---volaxujanali.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/mokofikutexarokevasix.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a34e3c60---70332957415.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/bevidatagosixidipu.pdfIn PDF document text
    • https://jjpremiers.com/files/3090560487.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/80651957577.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/pekasowutenovovebagur.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36145fc20---raxegezazazokefox.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xefokojitiwat.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f427f8e56f---6182848138.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/51437624726.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c90f7c796f6ddd6e3d75f2bd1c5987f2/60366352541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+football+streamingPDF 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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 17144 bytes
SHA-256: 9d275dfdfac667dc1b3ff3a8c3051df2d2c683b31a8e4ebdd89cf701b2d89fe0
font_01_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 10676 bytes
SHA-256: 5b42b2e75d786f375e534c7daef95f39d085f62de80abcbae778b05b79b1fca5