Malicious PDF — malware analysis report

Static analysis result for SHA-256 838fb40bd6e3d67e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 18:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 356236c4bdefc78060fbd4442534c42c SHA-1: 3f989dcfde0ec2ef90aa66c3a17be30d8d03dec2 SHA-256: 838fb40bd6e3d67eafa9d5e73241d8003f075325128d2c7a5f4a6e28bab174d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://smidgel.ru/uplcv?utm_term=guia+eroski+camino+del+norte+pdf PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9221886020---repugo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4e7c581e00ea10961e78709f18b2d740/bonirikobusevufu.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/muwapinirisowu.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/98822835739.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/xigojoxunulugos.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/1f8f857aa85754146e8946d02fe81f02/24296639053.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc435cf96b---gapewazuluminiritedim.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/19040003812.pdfIn PDF document text
    • https://raljob.com/userfiles/file/zavanugom.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c12d3892ea8aa7d2855f3cbdc862ce30/37488836829.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/61681968209.pdfIn PDF document text
    • http://szm.hu/userfiles/file/10381083674.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5281f186077a6435161262fae321db4d/9519588293.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/a6ssdu37kjfu485dcu46k5hme1/teled.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/51243007397.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/48482745156.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/xugodatido.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f500244ea---gitidazagexexejewara.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/gozajafejofijituvubal.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/40743196558.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/kezadomanokaweb.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/besugejubedokiwaxutolora.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6f76a706---wukubusoxowepikudofodi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/5037656785.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/94380693559.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/larenejiwuduzagokemen.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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 11012 bytes
SHA-256: 2f739111aa192a259132cdd18a7df21795fdebad082d67930464d9084fa82b7e
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 21332 bytes
SHA-256: 4b4225e0c7a60c3f6c8118d5a241dfe15f56dfa31e1481499febeaa754b11ce6

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