Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fed4f791ce8e13…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 19:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e1a1cab837fe739ad54a635a9c30efa SHA-1: f4f8524aec6f58898fcb29aebc2923494123ee1f SHA-256: c4fed4f791ce8e13ff105fd78e7b8782b767e7bb3dc5bf20253f6711421a0333
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These URIs form a link farm, likely intended to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=android+store+data+securely PDF link annotation
    • http://aroma-es.site/yamituki-n/uploads/files/53816518821.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/c0aqutad6454qkeofgu9jncnoc/17861743459.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/82639196482.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a4e68959983da9276e6f9713629d141b/vovatibotates.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/93060309441.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/63152793401.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/79806217658.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/ruwajarepaluruk.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/77734456423.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tugaxolikukol.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/7387259902.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110978e12a---wimojetubalakugori.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/52388477855.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/pazafepepam.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/luvasapedefupomube.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/sibamurukemodewofudi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8e91c79b400a563d4cf8bd9f7eaa3465/bivirotubax.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071425104589.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/rekumadalamediparoxosune.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/29557270949.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/xuxikuzorudalepir.pdfIn PDF document text
    • http://didula.ru/img/file/6057853303.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091708430265.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b774fd1d0655684b4d354685c72aa60a/26963593004.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f937ac1---16132237122.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/nazaragoguz.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_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 16408 bytes
SHA-256: f80144d38a693a6dee5d0220e56b543cc54d4746ba79e506921877d925a1f259
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10560 bytes
SHA-256: b22ad8805c19af1b7f32ab9033c96555e874f1a0d66a4d4dbe2a078fff9ac1c7

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