Malicious PDF — malware analysis report

Static analysis result for SHA-256 894dbb69ac2d563d…

MALICIOUS

PDF

85.3 KB Created: 2021-08-06 18:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7745b2d3e8a6c69eaec33ce59469d977 SHA-1: 9bb5ec4b1fac5ff84e849bdb8ccddb8441781907 SHA-256: 894dbb69ac2d563dee74d4b7dbe24a6c058de3c7b7b91e2006b7820ff9cd00f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains a link farm pointing to multiple external URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://drafthe.ru/uplcv?utm_term=ccna+3+chapter+1+exam+answers+2019 PDF link annotation
    • https://groupburuemas1.com/contents//files/36503751211.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a9df5ma7h7kle1mmkbfjjv3ts1/23750451497.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d18f148477513f01ec11a692d584c7bc/bazaxerizixusokofi.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/ruxutusodirakodeve.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/79425581440.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3cd4f14c0---28748994633.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/kibuxenupopetitif.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/newepanokixuzapijajegumub.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/sozixoxisuxagikakigo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kugubepisisusawizovorara.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c71ceda32---32940018924.pdfIn PDF document text
    • https://guijek.com/userfiles/file/4764834761.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160940ada18437---gikifijuwizagowidufumojer.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jewinedof.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/mifut.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/73237185627.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09c52635a---koxuruloromonavifoxobejaj.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/80182936046.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/rezodejupegivifu.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/71531331168.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/63544118758ea29f93eb9d4c11e68179/fofemujatagorije.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/36912647083.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/67902885055.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5aee709090cce7598ecbfd572084667f/fovejalevaf.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/dakoninafekupu.pdfIn PDF document text
    • http://deauville.ru/files/file/88164295743.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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 11236 bytes
SHA-256: 6d42de66623f6a0d2c485b2fda0dbfcc39845a5da73fb6ef4f9c1f46c9281f3f
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 17368 bytes
SHA-256: 2234e0ff34aa12a971574a947d57068a4b2a7412d8d42e05938340df54f43513
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1