Malicious PDF — malware analysis report

Static analysis result for SHA-256 100d57e4607b27a2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 04:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dccf77a41f938d74aca4237949efecb SHA-1: 62918e3122826ba82ee1bfb75767c8945f808f11 SHA-256: 100d57e4607b27a2f3bbb315f7f52dcb465014444883b1e34f3ab00d2f56b314
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to potentially harmful content. An embedded JavaScript stream was also detected, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=lets+vpn+free+apk PDF link annotation
    • http://gocep.org/data/userfiles/files/81616205797.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091000360848.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vowagewulujukosuzonalig.pdfIn PDF document text
    • http://erictex.com/ufiles/files/telemofesut.pdfIn PDF document text
    • https://eslms.com/userfiles/file/pifapomesigavuvigiwo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5e93bbda13c76b846301a2f020879cd1/boguzunatogesuxuvetuwan.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-21/20210921050400681242.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/vazijumibuwadugores.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xixumibu.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/sufemaxajafubiliwe.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/lajuzotukase.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/42912117205.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/18058084682.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/27548905266.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1c0f87b103c4c4d19dc8e37191810fd3/29875841807.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/lurukirufemegafikifodobuv.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/35521927705.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d19b39c5b072b829dbfbbd95fa50758f/8263456861.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/27294157036.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/77699507902.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4f9cdbc79d4c5056d51cf63a608313a8/62960511697.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/rofinubufabawenuxatis.pdfIn PDF document text
    • https://mangallagn.com/images/file/42210940918.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/39322698096.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/xoloresovoxes.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_off0000be44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE44 18000 bytes
SHA-256: 686525588685e92d1f1171e51fc5f79328a7faca7a811b05e583f52777b431cc
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10208 bytes
SHA-256: 4ca21147f97d342959a34519d27b51f73f2f1625ea1407c642e692c96dd95761

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