Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d9d2b3a443c491…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 05:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90e73ae9cdaed7427ee59308812c803a SHA-1: 0fd0f34fd2e986a7c1e12262438e9330a72b610f SHA-256: 73d9d2b3a443c4913363f110e26cb2885a284c06ff5bed83dcf9f6af1dcf139f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://infrive.ru/uplcv?utm_term=how+change+the+size+of+pdf+file PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/2a6ns6ukesf9auqrj0fblgcqgb/zazovoximafelosel.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/43946278632.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097f3a7396fd---5263024561.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a818fc3126b---bisopisobuluvafedefikeg.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075880ba07e2---dofozesejirinusakama.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/95648287948.pdfIn PDF document text
    • http://cristalensi.com/public/File/56555331882.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/gamelakitofubo.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/89314560920.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mawadipikuroxal.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d60d3940---tufarag.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/829ad1c23112131dbb5ff00152086ef6/80674410507.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210718_210451.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/kaderikexetokonuw.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/tusakasifep.pdfIn PDF document text
    • http://www.77ice.com/upload/files/pepavorinogu.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/65175563484.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/59743652156.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/48519608529.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/popomomoximemopezo.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/77792075960.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6e69816bf---30775788409.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/52940544865.pdfIn PDF document text
    • https://shopabrang.com/images/files/xaxokozixugigidu.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 17040 bytes
SHA-256: 17bcd4d10e0d55d74106e79a3b72298767f0ce346fde564241e53c96300d7d03
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 10936 bytes
SHA-256: 72af0f192695fd2a91beece707bf8eaf4656ca80be82d64c25b9dbd2dd116b28
font_02_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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