Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d30a58c7e6ce4ce…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 08:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b23a3c055189ddf79adf4cd3e17c0c0b SHA-1: ded06b5c5c0d773c81ad15e85298a90b7465c976 SHA-256: 6d30a58c7e6ce4ce5dfbcd42b19f5814b0010430e373bc70165878fbe29d5ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown URLs and a confirmed benign URL from Google's feedproxy suggests a tactic of using both malicious and seemingly legitimate links to obscure the true malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lednotice.com/userData/board/file/bepapoteg.pdf In PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kasivizabitogekiba.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131821104340.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905c4b2b9a---63041862585.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/61176546161.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/rodipovunevuturuzo.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/funusubas.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/18431226022.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/75531854305.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1040da145a525226adb9cc1034c01d06/25177187211.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390108db059---91309504048.pdfIn PDF document text
    • http://www.centralperdana.com/file/23816598680.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/rofamuvovigafodinubi.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/navidamab.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/14909475265.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/98505080273.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/gurugaguxubajarukagezevif.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50777340933.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/vosipemesizoxolamegon.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/33701306901.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/13374242120.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/32391387434.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091311032473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=twinkle+star+mikuPDF 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_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 20840 bytes
SHA-256: bd242b240508597512ea7f4096cb12d7d8ec9b140dd421d65106a3b85be39f71
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 10388 bytes
SHA-256: 8a084c14d3d0595ea6e49119ff77fbbe9b64c3ffe127c6acb7b26e42133dc657
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1