Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4609c9d51fe9e21…

MALICIOUS

PDF

102.5 KB Created: 2021-08-10 13:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d740db1c21f101e9a4fc742ad7de5e71 SHA-1: edf9c9bb8f7192b1e4efea614228ff8faa8b0bf4 SHA-256: d4609c9d51fe9e21897ae0befe4c3214204086612a86b48051d12c4645624980
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://garglob.ru/uplcv?utm_term=how+do+you+find+subnet+mask PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726cbbc1c06---zanetan.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/cerp8ihbn932v23o0ae82u7p6c/tofojawu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210523144159_1949863335.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/dpiovi7ddirqm42a26llbm65lq/99372794129.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7921fc66d9---47998536685.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da720c8470---90255063002.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/09f4012c411a878f5bf052ad43ad81cb/31664236257.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//nixajutafizamalavo.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1625456914.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dae37a959d1---93025480705.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608151b7e1b77---papomorixobelerakowoxefo.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/laruzewinuvifazazowifo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/92097117376.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/61866481615.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/dmdtic7qsffe75uqfvmdbhmr05/10309414113.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fb39ec148bbadb893c83bc66ccf6ba7d/26462478669.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/46436942517.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc046b2a54---xozun.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/vepej.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/r99fgeq0adfejd7cip5u2str1k/jevogugakamul.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/gofud.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nofosaxexitavemizifom.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/renujurapo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258650596843.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_off00012b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14331 17756 bytes
SHA-256: 294e676f7e685c3131c78d6a237eab6f468697cdf871792c3e80c8c7bf120368
font_02_sfnt_off000171f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F6 10892 bytes
SHA-256: dee81dbb308d632cb3fd3f7dcd0e5592e84b1d581811c8f538baaa5d73e77024

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