Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e4a4c896896df1…

MALICIOUS

PDF

100.4 KB Created: 2021-08-15 12:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f7215ca0b724d78b3456da689d4d5e3 SHA-1: 60f56cef56134aca3a2848ee345e4f4102b4ec8a SHA-256: b9e4a4c896896df10786285e22784b42b6636594473df6e04673ae298a4e871e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161060fcbc5ec0---mekagefu.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607db08cb8153---danojuwa.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/60031daba99ae80c2f17ad1175396ce7/ximimuxovefazisa.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/nuzijopewoteridaz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/58746ea55151191cf9373c8f381d039d/11026071797.pdfIn PDF document text
    • https://migger.dk/userimages/file/manazogajudevijo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ec9d1b9bc75---samug.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2124aee7---xijizer.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/25367079917.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/59385463437.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c58816174---pipepazawobet.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3d31c39726c2f82d070cff5f46a85d41/sabiromonolemuxurabup.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca14e9203d---luzekezi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087599472dfd---juzisivutexuber.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/89910716702.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rexotusufebulekulebuwutub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/26feaf97da82a08e015ebfaa4638a5a1/tetijabujagov.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/nutub.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/kininonak.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1iufor61qj6v8elcdnlk5c085i/jobaxoxuxiwokulupaf.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/m0bditbf0c5qas9b3la6rga0mr/22279589957.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075903b940e1---53566494153.pdfIn PDF document text
    • https://tadimtursu.com/image/files/wemosunudesanebopizoneka.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jegopebedogupajidonuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=harry+potter+y+el+legado+maldito+cuando+se+estrenaPDF 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_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D9 17988 bytes
SHA-256: 56597140d897f7a65445cac9e457cf4a3087da4b65405917d5f3edc724101785
font_02_sfnt_off00016709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16709 11060 bytes
SHA-256: f43a27679ccd26ae85a7424ecc8917910dc1f69276b3b8f810e5e2488b919261

Open this report in the interactive analyzer, or submit your own file for analysis.