Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5061f31c759731…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 11:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6239a72f42cc2bd91dd2998f01dcace7 SHA-1: fdf153ce2af7be4d53a793fca74c111698804dbb SHA-256: dd5061f31c75973121462ecab2951a732620850b59059049b71ca92858abb98a
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 embedded JavaScript and numerous URLs pointing to compromised websites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=rolling+in+the+deep+guitar+pdf PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/57a100aa8940d8e43d0253f0b931aab2/tigepek.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f4a869af15d232f287a0abf440c53934/lizerikiseweniweverubi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160932bf81002b---jaremow.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d59efc0efca66e89f60491748aac4768/80795639549.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ed2fu7okp0ncuhgs13uq2ualvr/61382133947.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a56107d86cf82127b32fc8ed66108e64/buzojejademenazaji.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/62946826075.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/tijubafelefexenodor.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/60647588600.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3a49b4c0---94828782252.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/nobadasifafoxabusul.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/28d3eb9712b5d3387761ad653d91be30/kezusiralozusomugada.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/6981985784.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9532352c0bc7dccdbf41ce33c4c19e59/25657787837.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/mipuzizukilawopagaxes.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/88304248601.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/32106061188.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c0b36da33d70ae69b1a14603789c882/39700145508.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/xuluteren.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb3baabcc---4891213516.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/65136918185.pdfIn PDF document text
    • https://dm288.rs/slicice/file/julexuxelataw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b015b296---bemowurugomisedagaxinaruz.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/87250673374.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2aad06f2e79e21b2862098f776d0785f/xurefuxepiletapazagadaku.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_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 18080 bytes
SHA-256: b592fe8417943bed4ab81365bb2aac6d058dc7d05c24f685066266e6208715d2
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 10752 bytes
SHA-256: 4c8158de97e7910e91c36a876635690be9856e508e7be7919c94dada3e9a864f