Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8af3499ba30df7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 16:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbb60201a6c21342257d9e9c8b50c8bd SHA-1: ba9caa186fcf45604276526130fe498ae4ad3d5b SHA-256: eb8af3499ba30df73485ef8c618cb82286f416bd57d63a357900d30a675ed50d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The presence of multiple external links suggests an attempt to lead the user away from the initial document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://diedacorporation.net/freesiafiles/file/jakorirulo.pdf In PDF document text
    • http://ombs.ru/uploads/files/wenupezikekukijovusufoso.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e231969d468b7e96799cb4443340c78b/burevaziligizoveraj.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/pagozigosexikak.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/sowowoxifumegexazabivitik.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2624fc75---junodone.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/78569189675.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991a97b5b47---werukexovowomi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/64be6db47c7b3186814b1cff682fddab/mikinajemozakatajafatebaz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ea6k2j2d614mbbfhocqss77ia2/97678489268.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/57397945742.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160833486b1311---pewepe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079325e6a2df---fetomiteb.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd3d8ce05c---sonagaxuwatiset.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/13012245848.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf70189f1---kebasej.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/nozudezipokatadurotajerix.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fifununewaxeralakijaz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b071e090cd3670404e86f9166ae535eb/lixemidoxijobibozorod.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1da73219f48cf6628af09cdbd2f7f5d6/liwakujo.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/rudunogat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=never+have+i+ever+book+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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10452 bytes
SHA-256: efd3ad3bfb82a5d65d279cd165785b6a079613fa2f63e40481a6dfe6db0fdfa0
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 17480 bytes
SHA-256: 1058d459720ff9181ef948478a9609539beb21fda5af7efb8979f269efc0cbcb
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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