Malicious PDF — malware analysis report

Static analysis result for SHA-256 49af777b25f1a0ee…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 02:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8c129a4a8695a5e371e5bb1cc0abfec SHA-1: 42140040f2e0688c5c9eb79fe1cfab241177324c SHA-256: 49af777b25f1a0ee16522864d3518b8603d7e3e8edd34becf40caaf13d7a39fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sghscsjamarai.org/guruhargobind/userfiles/file/zemaduvodob.pdf In PDF document text
    • http://svx.su/ffile/file/91803729604.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/kufafukapopufibunoded.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/95184362104.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/55002077225.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vizotonuzudibobe.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/55605645154.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pazuvevadodezadudesasa.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/48484400740.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dced8092ae---varujenowizoge.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kagarafap.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/jaxodinevokeladonujapaz.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/revejizo.pdfIn PDF document text
    • http://chinalabware.ru/d/files/tojekisoto.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161484b8fc1947---jisazedulivaxubuzobu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0t345o24re87f07lltthlhfil1/fizugivuboxewuruwakaw.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/liwagovebagozot.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/62668aab87f7e3b60e3eea13293e72be/71967434350.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/lavepojexepoxofikulekal.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/97963818447.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/kavonipepavekewuberibiki.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/tugagegaxulubukefoxakazu.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210911000139.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nuc8a763v1org0vvv0kvh26raa/xukexez.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01d1dcafb---59802310162.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/girutopejugokefosedegijal.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/deriwuvifim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=create+locked+folder+androidPDF 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_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 17788 bytes
SHA-256: bd57d5fb7c6d1865022e9f661ed373258f49c2ef40afc626bc9ae8cc030a01c4
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 10424 bytes
SHA-256: fa52d8039506b7671fc4fac488d6bcc769c0e0282855a726d0eee3780cd2133f

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