Malicious PDF — malware analysis report

Static analysis result for SHA-256 533c029dc8bd0338…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 13:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d250c12da6e27ac063e27652fe91b0c6 SHA-1: 5c66376c2fc9b0a8f223a1318ee34a7426e8e800 SHA-256: 533c029dc8bd03383dc0b5a1b0f5accea2b42bbb2f6f5c9449296505ec0a9dbc
164 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. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'download button' lure further supports the idea that the document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=golden+rules+of+english+grammar+book+pdf PDF link annotation
    • http://adamlegal.com/userfiles/file/32367706759.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e904ba430---50064975484.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8807d9812---6845430354.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/67862630533.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050223485455.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7ad9799---53869135630.pdfIn PDF document text
    • https://beltamas.by/content/Files/luwowajop.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160fe85fa22e47---gokowazumafopame.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/vijagoze.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/texuvefejafewuneterapet.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/37311161229.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1a6157c0b20379c2d0e9e0999ddcc3eb/68086453466.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/kolaxuxijotix.pdfIn PDF document text
    • https://ahha.az/userfiles/file/bowijejavamevojofop.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/62450784869.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zubemigozanewebavewefor.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/j57lutm1d2g1f5urqut4i4k5d5/nowosum.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd6edb229b---30848638625.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/webabavab.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/labudodekorusimabe.pdfIn PDF document text
    • https://nada70.org/userfiles/file/64372962998.pdfIn PDF document text
    • http://artospace.com/pics/file/vurimatirogodeso.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zefajeravasaxu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087122687384---94482627534.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16464 bytes
SHA-256: 3515448fa24cb8417163b1cd1d2cf4da2f9b9c9dcd76468036e37fd04f92c245
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 11220 bytes
SHA-256: 5fbafb6ca5270c94454b3bfb61ed85c42815b1548d3bbb11f188c4a73cdf2325

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