Malicious PDF — malware analysis report

Static analysis result for SHA-256 60aef0bf06808ed8…

MALICIOUS

PDF

164.0 KB Created: 2021-07-04 21:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afe3f3f0cd669159cf4c80a636dee1cd SHA-1: faa5d805642faebf6c435bb46917d9bdceac9644 SHA-256: 60aef0bf06808ed888e7a4b1f2d051db91a2a6fb688f424eb0854bae184bc278
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The PDF likely exploits a vulnerability to execute JavaScript, which in turn directs the user to one of the numerous URLs, potentially leading to a phishing page or further malware. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to exploit the user or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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 http://etabetasurvey.com/userfiles/files/21279264389.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d646f719f01---lefomaxenijudimikez.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5060295be---pexokixepawog.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/jawula.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7r09b9g0ce60dn11fl04e8nplb/solezugigopadovuvidolel.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/zufupilipajogezajir.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/47052162107.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/38252644785.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070111fe519a---48925973490.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/juxixujumupasiralolisugan.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/21rcl0khm3lems0lk2lnv6qpaf/vusike.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210603_A166012444C58293.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/tosumarirepegagatujol.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ddb3a6dbb---bafazato.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///88644632757.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d3d37640f52b6ce38fa95c76d4d3c67e/redeginusam.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pijefemodumid.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/3537446769.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e1ad5c9d---ladiziboz.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072a025d5b83---kajawabewe.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/66666625761.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/98257359721.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/nusisejagoliweted.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3ce8dfec---21955484964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+know+in+whom+i+have+believed+lyricsPDF 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_off00022321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22321 17620 bytes
SHA-256: d794ed64249a44fff8c76e257b8fc9c6b9fc467d41ae2f213e469642bee48761
font_01_sfnt_off00025174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002698b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2698B 10988 bytes
SHA-256: b778f322cc3cdf82f2f55c7eb9f2ebb713070d4879032b1c2842f44b14981021

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