Malicious PDF — malware analysis report

Static analysis result for SHA-256 281817b74348905b…

MALICIOUS

PDF

91.1 KB Created: 2021-07-02 12:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4f32d39bba71acf884efbaf35cac6d51 SHA-1: cf59e286cacddadedd71695d1c6ba0c1dfbf1202 SHA-256: 281817b74348905bf3ee8d7966aa586a58987d6969c12ee9074d2465045cc223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely intent to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://pamat.ro/UserFiles/file/94548685560.pdf In PDF document text
    • https://avenue102.com/uploads/file/60483573694.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a117a5a87f---45410768491.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62499ad50---jagiwugiweme.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/28440182438.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/72760166782.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071f913ebaf2---sexitavunazem.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160811088657dc---nulajukezuvusifesudutofov.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/zotube.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e802b86a70---toxobawopolufukegoniz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1nfjbuf39i0u0c029l2v7d40a1/63437808948.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc3196b5c---gusolanodavanuvava.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/51009604132.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/78218002376.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/sisowoke.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5d03fa2c4c09a2791b81e9d19d68fdbb/29242913185.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rk7qbkglqtikguon5m8opujjsd/30232017196.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff35a5ab06---biwipexukijapudo.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210607020951.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/26d309af649e8d5837f68a980803697d/59069830320.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210603_513AA78E21DF1500.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849189e0925---83581155113.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/50279859104.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/divebibixupir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mother%27s+day+infertilityPDF 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_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 10592 bytes
SHA-256: 4ca4a799fcde729e5ae662f5f33e3906a86ed027ee132b298bd81e3e753a7c7f
font_01_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16780 bytes
SHA-256: 117e99b3451192c0f6177ab58c9b0d1da98b25596400e96db0302724c704118b
font_02_sfnt_off000145b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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