Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4d103fcc551c03…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 05:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0b8f222b485b4d7d88ec8a907411b21 SHA-1: d169f754d04d45cd4001bec6f8624d748481244c SHA-256: 0b4d103fcc551c03b7f826c5fcdef333ae9f1c944a55ac54ab28d7c5843bb417
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, indicating an attempt to exploit vulnerabilities or redirect users. The sample also leverages a link farm hosted on compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The primary purpose appears to be directing users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://spcinternational.in/ckfinder/userfiles/files/1858706277.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae2f9b1a3333819f948a2a27268b6c4b/70648806024.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/sirugapumiv.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136399d3871f---17435265840.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/90008276458.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/nejasadenelez.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/76598510400.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba399d4bb---11197984943.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/tagalegisakebi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6175b7a---79411351650.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/46192172796.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/durolupupij.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_120352_183.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_EC4D37009B76FCAE.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/teroforewe.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/94911802930.pdfIn PDF document text
    • http://haai.org/upload/file/80595898986.pdfIn PDF document text
    • https://kimcert.com/E/file/fibukisogavijimufasupeki.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/mevinoru.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/nuzugoga.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/97549504805.pdfIn PDF document text
    • http://dezis.ru/uploads/files/64565159030.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53981ee28---sisifitaxulejo.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/pulamiwidolerufikamos.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/52535358337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=localizar+mi+movil+robado+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 19264 bytes
SHA-256: e582b78f65b4621aa55acd1da74df19b6426855f76c8eb9a4e3a0e2b79f7650f
font_02_sfnt_off00013936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13936 10356 bytes
SHA-256: 5e511e989847041c1a10e47e50c1d77bc4573239b8cf861819985656edc48384

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