Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf240e98464dc01e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 15:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b1f31e8a4e08268ad19782d8a53d7bb SHA-1: 7b523c85335edc3b3d18972f03a0709aae0ec750 SHA-256: cf240e98464dc01e867c63aa19f49aebe113efea4a6e3dfc51d7e6c76f6f9391
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a deliberate effort to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=top+gba+rom+hacks PDF link annotation
    • http://chekeeh.ir/basefile/chekeehir/files/powivum.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d6492797b6214b8fb3980c158d090425/27153614158.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903045848135897.pdfIn PDF document text
    • https://steammining.com/userfiles/file/17645973425.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/gafuweleliko.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/34606103803.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161404674943f2---75970110026.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/setolivusapegujazadujam.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/93e88df70f33e66dee57109d9421a20f/kexenasejozikorit.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b29e11c79548eba1fe6778378e082f8d/33324276208.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/puzogow.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/11564807777.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/12986181570.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8dc4b8b02271b13abc4c405a7df85989/moxabefimidafod.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf4c20b13---sipasev.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/49764600266.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffdd2cf810---gepixek.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/setiduxenojigekugado.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132460c05db7---bigufefekarofobiwagiso.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/6307685268.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/vanoj.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wasutusib.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/dukeganar.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/busovesepode.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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 17316 bytes
SHA-256: 2941a810d0413b2de6055cf870acc0b6e7c0fee85a36a71c239f929b2cb262a3
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 10544 bytes
SHA-256: f18fabd9480c519abcdab510e96de73b0d3aee06432b2ed32d1d450528b91fcf

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