Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c723345ab43f0b…

MALICIOUS

PDF

89.0 KB Created: 2021-10-16 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7517850d45335eaba7329bd40c0624b SHA-1: 859a352bab785cbc1447761a0b8facd01e271a09 SHA-256: 98c723345ab43f0bba2fc6c18f1f6ad8f430e7263d7a823eb87b9c6dbcef70b8
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 delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://orgue-chantepie.info/FCKeditor/upload/file/firosepezalozizumelux.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/67584697901.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20211001001833.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/17439001850.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/19518528718.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/63490137873.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164ca1b3ff75---2131727913.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/94855265115.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/netesotukubegop.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/zuluxiwizoratodelavomibuj.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/54875871585.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/89123057289.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/gugatobusukamalemuvo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be22b2bb52---71368370328.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/mukopiloruxizukaga.pdfIn PDF document text
    • http://schokobrunnen.com/idata/tetem.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/tasoxibijemat.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/13458613347.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/jakoranutapalumi.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/64552570426.pdfIn PDF document text
    • https://ms2oke.com/contents/files/78940191691.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109150434058683.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/dirukuf.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1a83f7513766969a381e2f5377c4c4c4/mevukokokaturore.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xanug.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=definition+of+reading+skill+pdfPDF 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_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 10764 bytes
SHA-256: 36bfbeab5d1c1808951ecd1d31384cb4accb3644833d6360ebef8fd6bab4e951
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 17648 bytes
SHA-256: 72bdc73d1fe7cf4a9b5c3e742c1c140bdec6d2942b801caac54fd0c20110af6a

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