Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9f4c07aab5e18d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 00:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99d75ff0a0a6eab59637cc7e90279261 SHA-1: 8fb7a222daf961e85e2e39c0d757df90d90c38c6 SHA-256: 3d9f4c07aab5e18da915e1e395bbca4ae9d8af410cb17b3f864c4e4a3e129a3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm structure suggests the PDF is designed to redirect users to malicious sites or download further payloads. The link farm utilizes compromised CMS upload directories, a common tactic for hosting malicious 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 http://cokhibaosang.com/media/ftp/file/xagadikutobubusasamosup.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fcce5b194129737f6a9910b215650614/96895953465.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f6c9522cc1d7bcff09015d78439d93a3/29155461422.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/57006925113.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bee64f3f---raduwedejotule.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b1efd2d3c7c30e63fce6ee5a960a4c45/jadiwoxojawa.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc4b32196---66774658025.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/sozebugojetidel.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wezigepevusakodid.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2c4ea1c11927ef06f88527609af68647/kurafopapisutafajugima.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mloi365kmb4urg9j7gr1gl4pgi/35633692233.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/429016876890dd8687f8cba99cacfdff/52616418661.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d8b84ad7---48160679321.pdfIn PDF document text
    • https://huanghecables.com/d/files/lanexipugi.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/37900255944.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/5697037692.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/gubozad.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02370f8c4---muzedijobuxenajotasuzifum.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sutiwifekalo.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/cf4159f3e54631c66f38b376f25a2e8c/65773895623.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/8296166571.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/66079974829.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d2ee3e5c2e1611bd96d859aeb33664b5/65424432827.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086757cc670f---41830500688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=we+will+rock+you+song+lyricsPDF 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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 17036 bytes
SHA-256: 387173be2c74dae103ce1acbda40bec942e8469641ef0cbc0dba9fd722a077b6
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 10532 bytes
SHA-256: 9f1a4bb38ad76668fa00f9ee44a97c2014481afaaaddf7d7eab05daf9a14464f

Open this report in the interactive analyzer, or submit your own file for analysis.