Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ec8c8f3f899319…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 02:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d2fd91f2d977f7dda342aa62c344bcd SHA-1: 0b821787abb17ebe5e78b4257127aefc1ff9199c SHA-256: e0ec8c8f3f899319e124375c91e752d5d45c22c57ad727057ec72e9663ab8a41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://4bx.pl/public/file/detavit.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e8bf104fda739f70c5af2786c5141bc7/pizedisivodapifiwamox.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0eff785d9---vezosodi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/85833175261.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/67926340504.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2c4b934ab5fa9b22967b89b6216b539f/80283249919.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/badibigiwopubifutajajusel.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/74245592710.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tuzazadezerurexudilolu.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/33276866067.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8ce915261e4028ed62c6f0cb0384c49c/30692531613.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/bekogitejagireta.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4ki3qeid3gi4ed4edb8ej5jmr4/78532458993.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/14217872697.pdfIn PDF document text
    • http://cy2hand.com/userfiles/24141915248.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/pojusiro.pdfIn PDF document text
    • https://airbays.com/userfiles/file/14876621332.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a639551c9---41538997676.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/jewup.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/44711014166.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/57937d0bdcf1c50b756b9dd7e90abc9b/3332233524.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/55925570312.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/22664548756.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160790a2758c3e---laxenipomutidujope.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/3h272ullqtvhm5msqjn9332sn7/fenunetijudesufufekakaw.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b592a9810bf79078d6a85366ae60c462/7816333660.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/27670887968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=5th+grade+math+equations+worksheetsPDF 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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 11108 bytes
SHA-256: c523b71847c334e0eb5036219a472975974e10da4911355b2113a0d892e5df87
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 17548 bytes
SHA-256: a7a67bb9dc20c9c8308805b0e4a0115490171d4315f48d5a4b5bed8cf911b866

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