Malicious PDF — malware analysis report

Static analysis result for SHA-256 318ba2b42c6837a1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 02:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16ce23ce3ae530a6f075504b0849afe3 SHA-1: 6cf709e80754cfd021b49475855bc345738563bc SHA-256: 318ba2b42c6837a146108c07a65db34e4060395b9370f1c0f3e3916393dc91d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of embedded JavaScript further suggests malicious intent, likely to redirect users to phishing sites or download further malicious content. The ML classifier also strongly indicated maliciousness.

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://chcial.ru/uplcv?utm_term=samurai+jack+battle+through+time+android+apk PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/xesowofekukas.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/32145984370.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130be3e37b59---76954660356.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vejovideresasoxi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134e10b82b7a---pizepo.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/92442815541.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105ed2a1e4---patamibenut.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/jufakeselomuze.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18dea1c33---debawegumelewenutitalole.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328b7bea35b---mibizadumip.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/27457812657.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/51626317162.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a09c5f13---relenafowara.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795cc2215---78771743088.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/65914771135.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/36465698278.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/58124863886.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/sodakutateko.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/36237761836.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/sofapawoxorog.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/fulibalotomavijakuk.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/fobagoj.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/11503472619.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/98881198352.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/11162959943.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/57629795654.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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 17412 bytes
SHA-256: 6c9ecec60df99ef36bf1f25b7d3a1b6dbb88b70464a1a9af86c3fe5f45ee2afa
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 11328 bytes
SHA-256: db339684db6fb9caa8393421ecd9ff33ee6862473c6d45f0cf32972883cbde8d
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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