Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00ac65b7b066047…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 20:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 038b0f9e7d2e2a9cd8634f1e7be00d4d SHA-1: 8e09cd513c74ecc80bcb202dc662b00e920874c0 SHA-256: d00ac65b7b06604767d64f6655e3584a2d93c04e38d580004b38ac518cc05092
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=minecraft+how+to+make+end+crystal PDF link annotation
    • http://daieimotors.com/js/upload/files/84895834347.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/zubukuj.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rb1sngk9p55k9cls4fpvgtrs5i/satevuliluvowekusamav.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/41527700627.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2118c92a6---69056667672.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7b2dvd4e911cpd2kv5p43r5pk3/57364813022.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f2bf86dad874b7860cfbd48d5da349d6/6456134603.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098468c1756a---sojeganosetulek.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/60277298342.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/puwoxixunuvek.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c68efe99---68922600388.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nerojobopewoliret.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/88404883531.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160831ba109ad3---9354560316.pdfIn PDF document text
    • https://beliangka.com/contents//files/jadutufevagiva.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/86306722998.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/tugutu.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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 17956 bytes
SHA-256: 41a0a8332f73bea504b520de2c7a53ec9ce3b6d3920f9ac1c1a2eea0c775dd07
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 11028 bytes
SHA-256: a36ae044206d911719f59d7770c1066cdca96473d7af27e0e51e8ac9b0746b14
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1