Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fabbcf2f678514…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 11:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e28185bed724cb8b54a2bf57830725ae SHA-1: 6935980996b78f91832917416fee30b4ae2eabff SHA-256: b5fabbcf2f678514437a2aca110aa53ab914065c298061bb950e8426015ebfe7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://intrinhgia.com/admin/webroot/upload/image/files/77935446928.pdf In PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/bujujapikuzazafogozulad.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jofokufiginobizudinutup.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/16847902508.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/fa4cda60e4e7596a0ca56493a60e0164/rofobadeluzebuva.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16133637bc8410---94140694759.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109040758084384.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/18735196178.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133618b09090---fajugojerokof.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xuvavog.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l80144deia5uehg3qeb8omueo1/fofijisusufawanuriw.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/68982918483.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/520608508.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/20044541390.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/nugaz.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/81518222026.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630870494.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614039eb725e1---tepopiti.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57amolut5j1nds9pg5voucpagm/tetimadesu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907112215_glr3nl.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/96486023458.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133969925745---bewurebikafiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=xiaomi+ultra+wallpaperPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF65 10336 bytes
SHA-256: 7ebad5e5f04c03b224dad7801205fb6eecf014b63c58f6854cd4ee38070e91bb
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 23452 bytes
SHA-256: e802058708432b902ee6bd93e8a70c02a0dcf384b19488e3f48db037aecc4029
font_02_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 16380 bytes
SHA-256: e62cca045312918b292d130d6dbdb9eee357ae8462ef5226f02e869bf229e283
font_03_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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