Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0cc3f8b32d0cbf…

MALICIOUS

PDF

98.9 KB Created: 2021-10-18 05:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 229c85267c335caa7fe190701976ffad SHA-1: aab2426714dfb9932b834ba0635005886689ac73 SHA-256: 5d0cc3f8b32d0cbfea35767e209184275be54133296f76d44f213b3611bc656f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://777mto.com/contents/files/vijuxevumim.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/luvinakekarupozexulevad.pdfIn PDF document text
    • https://jotelek.hu/files/file/rajanagizugekipijo.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/26861418268.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/fevixa.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/20343909825.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/mimedofotimatilubovotufun.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zogupimaxowavosep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/795a982c68cf01dd70d1351d0ee6b740/dobumazarozuxo.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/vazafogazobobuzalaxole.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/54870949443.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/golixonaw.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/garesomexero.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/88106382044.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/doxite.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/92197086565.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615af95ac4d32---fosegikarafafavu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143d72545d0c---kovenitadanebuv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b72a107ee---zanagefegokejumovekibakip.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151dfbbef944---58747737552.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/vatimilekude.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/fuzatifuladazakomerokufen.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ec4259db---welunol.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=hazmat+familiarization+and+safety+in+transportation+test+answersPDF 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_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 19932 bytes
SHA-256: 88608a59b703397b47db65aad97cc3b508a2b77243f4d074779d1d3504359f81
font_01_sfnt_off00014c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2D 10908 bytes
SHA-256: f9cb29edc561b6d6c1d360feda5510a2fd8e10b36129c9ca7f36dc86bf8aa171
font_02_sfnt_off0001656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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