Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87b99c46b5c662e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 22:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2737e6b6dc4e128fc4dcd5348ba5b6b SHA-1: 6024c2c19d01c2b551ca55068f01d239140f1f2f SHA-256: a87b99c46b5c662e132c0e365e48d667c512ae85e773920ae190b5763ed1b069
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, forming a link farm. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eguiders.com/uploads/nosidenepomimilip.pdf In PDF document text
    • http://isgsrl.it/images/file/rusilutukumikuwe.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/bebigexoki.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/39721411024.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kemuma.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/89049419324.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/99547584088.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/bapojuwimejonilaruxoji.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/73574020259.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vufokad.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/losakujimalaf.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/6794350260.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/75cd15181d0a8df2697080105dfe7aa5/dukijawinagafisazakaraku.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/tasitot.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tonixixumigowowetiraxa.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/xamafuj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fada6468a0---rofekuzivubijikelebu.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_9590AD53E8BF33C5.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/73536847792.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef1f9deb3c72593710388cb341db2398/walogebex.pdfIn PDF document text
    • http://baove24h.org/upload/files/luzasolubo.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/48783622439.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/95685547891.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nokotajixa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/28ee0ce7b3a06ae2a35142e7164340ce/49144520525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+search+sd+card+on+android+phonePDF 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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 10644 bytes
SHA-256: d4161d903b35111023611b7602f2446c6a1839d872881ae5e158ba1d6b94b794
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 19892 bytes
SHA-256: c04abe4ffedb5bcdfab9857e8e7593b0b557f286186f48da2f50f547f75e477b
font_02_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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