Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf49d0c66199c7f6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 20:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e2fe9024284e2b73684c896f98f7b45 SHA-1: 8c9f80ff4aa484914dc5b1c1276d4d7d9c57ee5e SHA-256: cf49d0c66199c7f6ec4f8ca5c8926dfdca471b7eca575c428d4841e294af5da5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://synerhu.ru/uplcv?utm_term=playstation+2+android+emulator PDF link annotation
    • http://www.gamylai.vn/uploads/files/80911539741.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/47185154713.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/52702609505.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fonovezesunamoxigef.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4d25ujc2e4pu6semon9bs8modr/nituxoj.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/tutixiwunuwud.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d98710d99de3b13de8c800f49deede53/guwipasavawakiv.pdfIn PDF document text
    • http://cpviettin.com/upload/files/mutadimifasagokel.pdfIn PDF document text
    • http://195exim.com/datas/files/55944008313.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/28932234101.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168f5aa9b9---1014403412.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/mitoliribu.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/batepadalijeg.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pojifere.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/25881858024.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/74607965327.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/piwufitedirunasixuxototof.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141691b47667---gewisalopegatiboval.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109091516068477.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc5053b55---97796300123.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/60776708297.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d8b1d5f3---dikuzosazegugu.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/58512260416.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/91879382382.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/didilogitepexu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/de3cb4d11d60caff74b8312b1b2a73af/92245345938.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_off0000bc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10744 bytes
SHA-256: 5888da2b16861ef6accf0e9b14adecee37b1b018cd23d5ff6bae7af54e0f308b
font_02_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 18688 bytes
SHA-256: 571bd28a11a1ba47911b18cb0c06851965bdadff66fb959353c1b66af561877e

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