Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d02cac054f0703…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 01:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53506bc5f4a2090461d89f3100db20d9 SHA-1: 9047ee98e8c81bf1396baf72dccba87e32dd9ac2 SHA-256: b4d02cac054f07032a1b1a287b37af643ff958e487fa0cc76c80b5c2e5c10fdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports the malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

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://drafthe.ru/uplcv?utm_term=how+to+screenshot+on+galaxy+s8+plus PDF link annotation
    • https://lingchuanfloor.com/app/webroot/userfiles/files/merokasomed.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cccc82fa8d---ratorumunuvizolatesejo.pdfIn PDF document text
    • http://limoride.net/gallery/file/xebezedulapul.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/weridaveloboxetexizovu.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/88078636793.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • http://princeverma.in/uploads/files/jawubugudipisatavokufewe.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vixijilomanixobugarijej.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/27321092457.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/tumigoxixejoneserisuvifi.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/85031183517.pdfIn PDF document text
    • https://agermag.ro/mm/file/53275590258.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/28914516360.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/nemetotofasezovavusires.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/26257132986.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zonowemip.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zanovonokujejunopojolaziw.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/rujinos.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/5720101195.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/jolafedosiguvirataved.pdfIn PDF document text
    • http://change4best.ru/upload/file/jujutozedumezutupij.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5039e054f6d6c2b1d5021d9d7f9785da/butapirupup.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 18340 bytes
SHA-256: f3bdb43c8f48ec6b1297458df3bd4694fe860dcb7027c3df794e3baf68c6e3a0
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 11164 bytes
SHA-256: 293b6564c6942a303b426912eb8869ce431526cb1c0f013e859e11a2d3403069

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