Malicious PDF — malware analysis report

Static analysis result for SHA-256 b199d5d3bc4541ec…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 14:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8385ba8a1135f49f3168ebdbca823bf SHA-1: b7e35d3be1a14d441f21b036898370b17b1a23c3 SHA-256: b199d5d3bc4541ecc2de86e6db1d26f8f832be674713dde734c99370b5a50099
164 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The JavaScript likely facilitates the redirection to malicious URLs, which are designed to lure users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://omni-links.com/images/blog/file/sofagezinimalunuzakoxab.pdf In PDF document text
    • http://atomleasing.ru/media/File/44269241074.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1261d0f2---tewebedavimawujemuk.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e884005---gipelode.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139efba6b0c1---befenizupoxotodosumowivu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/04fb1a135e852472cdf8c92385a42df0/pozifibavegilugipivokiso.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/64409039597.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/dilorazitam.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/lanutumukojigifunumi.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/31755090567.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/lajopomolabazedumabas.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/maverutefixanikike.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/jofeno.pdfIn PDF document text
    • https://webmenuplus.com/images/file/85370313112.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcbfde7ac---67908419873.pdfIn PDF document text
    • http://landpas.pl/upload/file/97685359446.pdfIn PDF document text
    • http://shophouse.info/images/files/2491842809.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/45881958254.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210909022654.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/84311116461.pdfIn PDF document text
    • https://red-adlay.com/upload/files/negisugafifanevasutovudel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=live+wallpaper+galaxy+s21+ultraPDF 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_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 10800 bytes
SHA-256: a0dede00c1cda2b5286713e14cfa68bd16768111646fb11f97ee0fece6d552d6
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16880 bytes
SHA-256: 73b8e2e96fff0097621d2b7df31bc5390b2e010d1fa861dfb6643981c5a59889
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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