Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dc7e417512094e…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 13:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edbbb8c2744f4d53a217728d61baf79f SHA-1: 4996129d730eed8ac39a5ea78a17a7948f213d89 SHA-256: e7dc7e417512094e1c25a58d96b5c29855695f936561c1d01d6da9e4afeeb15d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised WordPress upload directories suggests a link farm designed to distribute further malware or phishing content. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50a92960e---67567686707.pdf In PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/60887374072.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/11699358990.pdfIn PDF document text
    • http://fedime.org/imagenes/subamaxisiz.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/fevuxivexivemeg.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e32493ef---78863976200.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/ziwevapufe.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xiwimajowomulonemepamaxa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1adc2a27---76732349693.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f8af24961e62d562efe446e7274e3ab6/38358352846.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/jekotuzapipejo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f5db7051a---15159392180.pdfIn PDF document text
    • http://i-physiology.ru/upload/finanawakigek.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lavetizujulemalu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105130457.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f98e90426---16926305480.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/tisukuradapovuvetipopizek.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a4eaf28864cf47bb35b48e96b4984bda/23074363602.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/rapisofopadumazoroxa.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7a05a36d5ea986081f3a5ae50b314073/95747009842.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2fb58c3e5---xubudevukezusagewupo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/70755478099.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rpc6ut9sqkcqjrdtatjjs671eo/23517142424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=showbox+apk+download+for+amazon+fire+tabletPDF 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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16376 bytes
SHA-256: 44e54eb6438c5d6e6dd85975f0d0fa689518a28c9b592e012044e90bfffa461d
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 11148 bytes
SHA-256: 93d6401337a5408dacce4741d488bcea9560d88db6a2af75a09f7f0f04b6b00f
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1