Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad84d6a71b2f30c0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-08 22:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bac467a669e71a866c29d3f520c49b51 SHA-1: d2da6875215ca2368aa056141631014012b2eccf SHA-256: ad84d6a71b2f30c059c73e23a46aae7113dfbcfd1c45d78ccd44b31984b734b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://abwninemile.com/uploads/files/48353484991.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/37875431905.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/wisevomiwovowupenavaj.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/xefiwipunuzanalix.pdfIn PDF document text
    • http://knipia.com/userfiles/file/dovuwup.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/jadomirasivof.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906162318867975.pdfIn PDF document text
    • https://birudongker.com/contents/files/50205975938.pdfIn PDF document text
    • http://pololanna.com/user_img/files/74734922778.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/7294970045.pdfIn PDF document text
    • http://qdjshg.com/files/file/52657189999.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/poriwevoxemogis.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/bozikavinapuwuvodoriw.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ujidkeqj55sbq7iad59okv5519/xudilapena.pdfIn PDF document text
    • http://lex.tj/img/file/bevulogolibu.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/49952991715.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132610eba4c4---zifetagisoro.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/vexikomepunipurijazo.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bafalew.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613153ec6d771---62528689770.pdfIn PDF document text
    • http://lblussana.it/images/file/zefubivoxuf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4ma0rukk4lcbp5fe6fkgi87h36/kesajotekapa.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/62431265456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=winx+club+comics+pdf+downloadPDF 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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 10872 bytes
SHA-256: f2e6556212d150175d5db9d7385d99942c88f723508009b1e1c5be0fd57d30e9
font_02_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 16000 bytes
SHA-256: f455f36ab815c430f0a77542225a77b7001050643ae0e037b2e599281a93a2f2

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