Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aec1199674b7ea0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 07:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b12578f9953409f9d723b3b2bc88f8d SHA-1: 19c226fc79ee462c186104816ce65bbec7e20b61 SHA-256: 0aec1199674b7ea0290f7992e540dffe1957eec139d5ab8272e1116106a12757
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting suggests an attempt to distribute further malicious content. The document likely serves as a lure to download a second-stage payload.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ikuseikyokai.jp/ckmedia/files/69591333452.pdf In PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/98456005740.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32df39525---sibot.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d6926ebe31847012a6b3f02f1f873262/20460175758.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902050353_1658564135.pdfIn PDF document text
    • http://huntland.hu/upload/file/4718597010.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/67167758902.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/16802512055.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e4311f4e---89403317128.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/dekedoxorefojigawa.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/91083985045.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kedupari.pdfIn PDF document text
    • http://fitviewer.info/files/file/32828746052.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zupadekaver.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/72317732488.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161422b38429e8---72826174556.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/62902316218.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b1a3a0c6---37359164985.pdfIn PDF document text
    • http://hanleyresources.com/images/kajonodusi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a8513e024adfcca16f206c0ca2a78ae7/dagajuweb.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109240855059472498mpn9v.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf9f48e1ee---21396080660.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/losulufanu.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wasisupewolotedotolim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=windows+10+iso+freePDF 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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16728 bytes
SHA-256: 59558bc510e2964dfe6ae25553a3ccf0c40a7183aff960b2dc677bfbe8c1027f
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 10296 bytes
SHA-256: 2ddb5748cf9491a35b5492340c89ecb2c5b5c9291bd338ac1377beb94c15f0ae

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