Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebcf84942450210…

MALICIOUS

PDF

75.5 KB Created: 2021-08-28 01:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f69eb16c4082ed25c2a10580c1beb1b0 SHA-1: b545ed5d4ecd8795f62be39c8e2da810fd0f63e8 SHA-256: 4ebcf84942450210fc29a5ceafd7141ed26bf85866f2df350dc97f88ac4d5799
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3ca894e8---27009669820.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/58148162419.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mewurosumat.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fedca26a3---31968454206.pdfIn PDF document text
    • http://huiking.cn/uploads/file/100331305855.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bad6be99d---runakenonu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/27e8334a7899251357f2c8f0c0c71146/kigasonomalazanim.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/dekudafatopujipotiwi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/skn6dd4hm7mr3qifn4jgtmco77/88798256135.pdfIn PDF document text
    • https://termofriz.rs//files/44438774159.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/lkbuug444jjdhf0fc4lss133so/wogizalunageselon.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e8b51597---zosukabopo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/43802189029.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/74069714749.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/74981355202.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d6f1b1294389b12de9725aadeb8d63cf/18612028197.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/sopituwizijupipifoxagex.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/jivifitenezev.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/61657776329.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/84915732203.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b780ccde179---ganasididulubuvixitan.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/69159810973.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/56877720847.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609324713382c---dutuxuraganiditero.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/pebonewodelisomuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fighter+character+sheet+5ePDF 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_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 16928 bytes
SHA-256: 5a588d7d2b9ec3da4421d1e9b8a443f781b55c0925ace17e0572a52cc7784cab
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 10348 bytes
SHA-256: 0ea6a7874fbbd7d683585fe47e1b0a25116b5d126aed5b5f9134ed930fcf3523