Malicious PDF — malware analysis report

Static analysis result for SHA-256 123726e235709f7f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 07:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b74b7190ee1af67911d59dcc65538c5 SHA-1: a839a7667d9a54a4bc39af6a6f84ae83442b02dc SHA-256: 123726e235709f7f6c52624be9b7be4a0c600f51b62e0a0665cafa43748ab50a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketdoanbus.com/webroot/img/files/dolakego.pdf In PDF document text
    • http://e-park.es/img/uploads/files/dekavijaja.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/bagiletide.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/bemofon.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/65169730153.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf0e975c2a---98101520734.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mapoduwenumeba.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/99065638898.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bo2rss08jf8irecfghm57crnc0/vimefeleranosutovumovoj.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/41c2060012db877f42918d7517930e7c/40994384771.pdfIn PDF document text
    • https://kawanmto.net/contents//files/tajimivimufofapu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f7a9f2f74246f1c7b5e080c6ea63acd3/jomodadojoma.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b60a835afa2e98d6d9e74f96ac5493ad/bilijisipudimikali.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d518cabf796c587a2241e7815393ff58/gumakudixafegudegivo.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452fc3675a---sogekoxozakir.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/49422011860.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8ec9114f---fanotosorapuzajevurunavof.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/58aca10d7e30d0664a02fcb55deb9c5f/34933251661.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2b66855f7e12181355504bd1e31466b3/tonule.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/ruzopi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jekuvoxepagalog.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fafbd17b3---88874501759.pdfIn PDF document text
    • http://saktigroup.in/uploads/xeserimigupod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+the+answers+for+delta+mathPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 17332 bytes
SHA-256: 933e56863af9fa3060272884c9d50f619fbc34ad3be76b9d9890bc137c5eae91
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 10784 bytes
SHA-256: 227da26066637438c5aa34a7aca2803af5875c473c885765e8c48a3f9b5c1a90

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