Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03d9399284521bc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 12:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3672eee9a66199cd43114c99e9f94d42 SHA-1: ffeb5ae0d4056f194638c5aa643313c124fd49cb SHA-256: e03d9399284521bc5d5457ff392d873dfd1098a08f1482d38ca5a2224ee314cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a lure for phishing or to download further payloads. The presence of embedded JavaScript indicates potential for malicious code execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://unibel.pl/pliki/upload/file/lenumadewonipega.pdf In PDF document text
    • http://tks-forever.com/upload/2021/07/27/file/narurilifej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266f7a7162b---92499163923.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210818215517.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/21997223979.pdfIn PDF document text
    • https://agermag.ro/mm/file/1027456398.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/23389215306.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c05aaea6b093d59cb6be2e7f00d58c84/dapukepomoxel.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/sosupa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbc74203e---8072762558.pdfIn PDF document text
    • https://t2sc.me/userfiles/naronowagufonakut.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fa00d544aa7---feduzurolupalokufaj.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/mabiwupowobu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/6htelb9nk4vf6f6q2l7vfgcspr/tijura.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f0500673bf7506ae78f7d416a3520f36/58355207045.pdfIn PDF document text
    • http://belst.by/upload/file/bowixa.pdfIn PDF document text
    • https://codecs.ro/images/file/rejap.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36feefa95---39774185359.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/luwenusinosuwekezesin.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad511f813c4---29056998465.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8d47e1967c000b1c8fa2f93a5636f565/bebosopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=add+header+and+footer+in+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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10364 bytes
SHA-256: aea11c3815b7ee78d613192b262e0e4b03f8e1b303b4816d187e0863527c8998
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 17612 bytes
SHA-256: 700afdd09c782a1d9c6befc00ecf42267260ea50d255b49e6ca38cce7d6cc3c1
font_02_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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