Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eace7074c9fe1a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 22:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad59ed0338c636575bd583258c45a145 SHA-1: 7e35683c7b0278230a08b52413f654578c9f6cfe SHA-256: d5eace7074c9fe1a5b61e6bef8762f7c536cdf371aad928e8aaecebb4f0fb501
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=chrome+for+mi+box PDF link annotation
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/rarilewojikowakigisebanon.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/79624831498.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/tavivezuwenuvinesogumuwu.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/vaxixum.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191874504143.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/31869170980.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/5623120118.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/vukekurezawadi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/mofipujinivesirix.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/bonase.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jedivonokekolenovo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c71343145cd25bb91bc019970d8fcc8e/63989500850.pdfIn PDF document text
    • http://belean.pl/userfiles/file/3747315739.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zoredanofevudokifapa.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8ce0f35c---28149349158.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5ha3npa5m5932pgvpbjrlvgumj/75828377322.pdfIn PDF document text
    • http://hanleyresources.com/images/zebipetew.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109120347252955.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/66119580208.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/32789205637.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/belurinexanagum.pdfIn PDF document text
    • https://aokman-drive.com/d/files/lalugatirakumuwinixaxe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/54or3vc1a8m2kbjgraptaua9kc/22920403774.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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10176 bytes
SHA-256: ed8c53cb782360d1f2e3ffc11b0c0e1f8aed74de62ea003d73dde1398ca77657
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 19500 bytes
SHA-256: 7bc9bce608b631b1bd231a4d71ed54781efafd129103017ee599a657aae51c20
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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