Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d0a32fb876cfa3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 22:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73cb45f7783586e4dd2180c0842a60d4 SHA-1: d71505d65c80a12c34c2fd8f8c5279b5e6f278a0 SHA-256: f1d0a32fb876cfa320c0e3821d93ff9402476613dabbf488c553357a69400eb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URIs pointing to various domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one of the URLs further supports the idea of a campaign designed to lure users to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+conservative+mind+russell+kirk+pdf PDF link annotation
    • http://ricarda-allegra.de/userfiles/file/97467770470.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b74892915f5---kosenojizuzumu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a6e227a5065b4bec9afe654a69c368d7/duvovitadifubiwu.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wazuxuvakiserovakab.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/33844258921.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kufudurekutifulorot.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/70124389676.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4fb28c03---mekivatofevufevekaso.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/37d7ca25ca23899b6c226b9434d412f1/11438734604.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4aef12917319df064b852d3aa1cf5629/70415369710.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/13144043911.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/fusosijivojupivasexawos.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b2aa842914bbce7b84961ab8a6c71437/wawifuxemugake.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/vomaju.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2633bce7d2ce125cfa20c37e2f70546c/zilomuwidodedelofalepoxit.pdfIn PDF document text
    • http://iviltra.lt/images/files/35412879786.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/xamejalarajosajedomow.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gitus.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/74376447742.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i3iburem8vi57j07qg94jj4m43/jozipositi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/3696db38a4309d8bfb2e419bc5f7198f/bozovugabe.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c6a5d053---99969689746.pdfIn PDF document text
    • 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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 17596 bytes
SHA-256: 6efcb85999e61fee0dd8f48a599a87fde45f0e4d2a254baf0261280c095b01d3
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 11104 bytes
SHA-256: 3ed830e6ba3bf9af4ca73f1dcf229e830f656fb8fa221b1d7dc8a707021c0eca
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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