Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb8b06253df0b25…

MALICIOUS

PDF

87.2 KB Created: 2021-09-24 04:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2ba6006ec30bdd3149178aa6ac8fb7d SHA-1: 35b6818c3d580cf3302a200aadddfebeb505091f SHA-256: 7eb8b06253df0b253baf0c67ca316f2776f556a22ec8dcd2a8c180a56ef4cc1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the document is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b138d91e2---22404962868.pdf In PDF document text
    • https://rajakeempat.com/contents/files/rizuxivisugapafuw.pdfIn PDF document text
    • http://topas.lt/userfiles/file/jiwudeboreputaxefivones.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428e2131708---50694710169.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/21871401106.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/77658659780.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b18f129f88e24217219658137c1e0930/deverikofo.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/fejunizupep.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/gobivukumuxar.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/kilamuvelitan.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cf73d1c9475a7d3a52d8ebbac7f5e30/95800341678.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/nisazixikari.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/93837323504.pdfIn PDF document text
    • https://kopari.hu/files/file/tevoxepaxebalufimivebimi.pdfIn PDF document text
    • https://citronel.com/userfiles/files/20176194560.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9b7a1ecc---moziwizexidobinuzidavoj.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/92793695850.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/67197528998.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/22783154779.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021919715385335.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/gepixidudujuwiv.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/dodivakatuni.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395904ab570---bipapepugukumatiful.pdfIn PDF document text
    • http://ellev.fr/upload/files/51436360287.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/sogugisidemilo.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/11383103164.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/38634583789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+star+app+for+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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 10424 bytes
SHA-256: 0ddbaf4469ba5bcbc8caa40270a258101bfd266249ba2dd0496db3798e7ff23d
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 17180 bytes
SHA-256: 9a6e68a9fe609b468e368c743f606fa5b21dba70af347a95744706e11a392ff5

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