Malicious PDF — malware analysis report

Static analysis result for SHA-256 992bf751da77ef3d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 06:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3632892ffa021f4d76f8c8713f1e20e9 SHA-1: 5db9249faf8a59fe33e527856b90da6465eabc82 SHA-256: 992bf751da77ef3d2824850134b06372349742934ea7a9060554926be6b89d21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=naruto+games+offline+3v3+download PDF link annotation
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/didojiseluvov.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92050f6af---jidadez.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/65328525389.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/xoredidezonudego.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/ziguwulilujinirifu.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/bepegipegodu.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/50447947559.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/jodinojavexaxa.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/gukuwex.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/66849373953.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/76835390809.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210904144951.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/39214026179.pdfIn PDF document text
    • http://esangsok.com/upfile/files/kemozujemezodawarog.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109102038219046.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/54590131933.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f97tf5pvqbsa2tmcmcb8gv5626/83899714533.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/totifaritinugawen.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140be2a5f0bd---duwivo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bd7a2b0d---tebivixawux.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161806499117.pdfIn PDF document text
    • http://ruihuitax.com/files/file/89092535564.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/65461614271.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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 11100 bytes
SHA-256: 42fd45e9fbc160a7cd2e80a7defcf70360743e1d2d2623e22323935b69dfcf8a
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 17312 bytes
SHA-256: f9e1bb51b59e083e0a0af482da788cea2012a4d34ced030dbe439f3be4be7f23
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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