Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a6b5a528eee05f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 01:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c67b2b4a40243abb1a488388814635b SHA-1: 6878ca8348448c3b31bf093102e7fb940a53fc91 SHA-256: 26a6b5a528eee05f9e00c9447a95cfc631b3f28f7e865aef3606043c7f2513d0
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier strongly flagged this PDF as malicious, and the link farm behavior suggests it's designed to direct users to potentially harmful content or exploit kits. The presence of external URIs and link farm heuristics indicates a deliberate attempt to distribute links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://chlahb.com/uploadfile/2011/new2011617/files/2021/08/20210815074802.pdf In PDF document text
    • https://blugarden.eu/file/61424102361.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///51599219149.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/kefaf.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/tozepegozavazerinorerev.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16123b062ce023---72054903543.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66a9e2cb3c1d3f8ddf195feeb74dec20/28318088061.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1103f40499a1dee211b0db139fbbce98/newetolafebodomoxiz.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/20403230614.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/jeberarijexakim.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2b396e67de1bf06da15b55f419228019/56511832128.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4a3cff7c---xobosubox.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/15113659519.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/gipofixu.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/87889009058.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c4cb9749a91b003eca49a143aa6ea8f2/sizupativezaguvesojazes.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/8792214530.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/00f80e99f61c4484d8cf5cff53f8f5c9/83328823889.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43076394754.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d92c2afaf---wosuwajafamopudimagijo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d5d31846---jamaliwuloruni.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5bd617604fcbc289421e22d0844e023d/faneba.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/94781306782.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/58557402018.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c1482431fa0---lutadunumikad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=el+liberalismo+en+mexico+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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 19496 bytes
SHA-256: 5a60f3f12a6382eb0825f14a607ee95451662521fb6d878ccd4a3f7d61d5bcd0
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 10908 bytes
SHA-256: 11151bbe07dc2de38b8bb4d4bde8144c730c97a276e33a632821632ce20b0a98
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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