Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe85c54175bdc5a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-06 05:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7c0881eb73cab271a01a5b542cbb585 SHA-1: 653e172ae32ad2e01f95235f6751597b0d9fb61d SHA-256: 1fe85c54175bdc5a3ad749f80f02966da277249c183084e5fc90df14352f15d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute malicious payloads. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=dave+brubeck+take+five+sheet+music+pdf PDF link annotation
    • http://longbienco.com/js/ckfinder/userfiles/files/rawir.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/gaxotadewev.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848942569f8---91665052771.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160987d396257a---zemuxulasadewumenazare.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/29241800488.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe73f1954e---20113071307.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/dapol.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/53009640167.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c56094cc---26999770394.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/97606230576.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160771793b8160---wivexafiloweduruwi.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/wujokabinikevesumet.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fokexetelifesonegefapo.pdfIn PDF document text
    • http://qdjshg.com/files/file/64767290323.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fc5fc2d7ab713a0b64dc26654e3b91df/nulifukojosejigu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bovabepozomonoxudotap.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/biobqqi98lehd3qq3r5aqf38jq/zigerawakela.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/pf3pqgb1tnsmvmkptb16733s7r/xuxoma.pdfIn PDF document text
    • http://euro-ex.com/tobej.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/60930885879.pdfIn PDF document text
    • http://belovosushi.ru/files/kofemimoviwiwemuba.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/40450313132.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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 11012 bytes
SHA-256: 06dd945ef0fb9812b7d6236c733878d65c8115b98f00c7dcfb6726daa4eb46ec
font_01_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 17144 bytes
SHA-256: ac31b380a3d7db3c8595a64f29b58ffee482a94084ee53d63707c8c0a1318c6c
font_02_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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