Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fd196a75c449cc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 14:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f91024ed9e2bf94191d0d598dd144e46 SHA-1: edc95d1d861fc17af57f9c047f9321967b826c73 SHA-256: 43fd196a75c449cc688e9000061ed65c0932ac1849623d02719aaf1542e45d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute malicious content or phish for information. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=was+were+meaning+in+tamil', are likely part of this distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=was+were+meaning+in+tamil PDF link annotation
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc29637eb8---xigupaposulow.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae5f8aded---razokuwosumabip.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lelutenuna.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/rivopazosanevesovawiku.pdfIn PDF document text
    • http://mesterek.net/tmp/9845774893.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/gexawo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dulinexupuvopitizozoj.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/jetow.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/dilipitopimowofamozes.pdfIn PDF document text
    • https://discoverthesky.it/file/2013808317.pdfIn PDF document text
    • https://mvservice.it/file/wepigozusoteguliv.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5ce868d0f9d7d7e3f956dc238c3900ea/fimepifabez.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210718101648.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/kolagikojutiramulebo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a0eff186f61ae7a8e4fe51a8a6938692/rorarowexiv.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/rivotakumezajudev.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/41364000021.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfed03d23---lidatixam.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/litiwuzor.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/gijulogumakowibemoxa.pdfIn PDF document text
    • http://poultech.net/d/files/77127289592.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4e9b2615d48a4e12e3391ab01c4d3cf3/48324044054.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2031a34ee---goxexogokovogopuridur.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/30114333102.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/pikas.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ca42946---wudubinopaketu.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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 10412 bytes
SHA-256: 1243e5fbacb8a064894dead90482e876131881644eb2323169086dbe3c0206ff
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 23032 bytes
SHA-256: 6ec9aa2be4a58bd70e9684978546d0f640095eb6a47ca91efe8d5a19613bfa0f

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