Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43402a2af4c2ec7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 00:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b1d9c78effab36ee48d9295a43edb05 SHA-1: 7249b7f29811185b9a3f4f48bfc625260bc263de SHA-256: c43402a2af4c2ec7d1c6473afbdb3307474cf1c4ed0a0a9f2717803ca88ed40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=uwatchfree+movies+bollywood+movies PDF link annotation
    • https://embassyinvietnam.com/webroot/img/files/fuzikojirulexenusexo.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/104839888614fece70272f.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/jujojulumakiseti.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199342467450.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/lifoxazitek.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614639a362a85---79423254764.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/94035815205.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/14447442930.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/52747150438.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/fazufoza.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495005592bd---winuxafa.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/90418293642.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/witezejonujezu.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/97196499103.pdfIn PDF document text
    • https://davnosti.ru/upload/18129143303.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zoxenamigeko.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/nugozenifaledogirivufu.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/99314582563.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/341475fb2bb6c589e3d506a347eff856/bolavuj.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/xodusepu.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/31754989447.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3f58afb---18475650497.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/35609467853.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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 14616 bytes
SHA-256: 8c2332225872d49c5c2852b8e6318a46c3aa82833a6433e05b19c4cd1e003164
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 11052 bytes
SHA-256: 3744e11bb035e3b47bade345490c5d7c23cd294e4b145e042d3e714915d334cf