Malicious PDF — malware analysis report

Static analysis result for SHA-256 6966da94cb0379ae…

MALICIOUS

PDF

94.2 KB Created: 2021-07-23 09:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cd888428935cec1bb97720f0937e1ba SHA-1: 47f5c6a468057c548a72dcdcc0be9880e8e0c0e7 SHA-256: 6966da94cb0379aec86367583415077aa6e45706f8ba365fa20ed90dc5821417
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://orbitsecurity.qa/pro_mvp_tech/uploads/file/12839141927.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d52b9c28f2ab42026eeae1d574df7851/72359867923.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5a67d4ea---25524925554.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/zaxiwaxudodokijofe.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/boxikusazajeninep.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/794103b2869e7c17429ee1acb3c7cbdd/30327312483.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a03726e12---40720895606.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/faralalolamebegi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/zerutobavexojabalom.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ab8c5f02cbb0db0f8353752fbad65a86/rexadotawuz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s338sdamk8cp40526rbu47j6f2/jagajuzidixuweboke.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/xivonobozuvazumateguvuk.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/95289885626.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wonuxod.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607256f53f77f---96966517366.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/wutamuduwokik.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd483fc071c---77004683154.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7687b07f9---temejozibo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27f3cf722cf5ae41fdc1b80593a39526/4271962891.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607709f5ec897---68529612258.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0178isucbarg376qvmfgck6rn0/fabizev.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7d1aac83---31914027738.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9501b6f18b4c48d5e831d07efd31cc30/93678937203.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/22388268905.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lagedapugofebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=properties+of+equilateral+triangle+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 19168 bytes
SHA-256: e7cbb0da7579cbce7fce8d52fcaa0afd55afbc41c23125b4fb30308a0a7d2d90
font_01_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000138ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E5 10920 bytes
SHA-256: 658974289d9c969614e1763d472067c3cfa5406b38306138f7c5c15dae99517f

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