Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0273486d6df86…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 22:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93933f260509ec008f94bc9bffc82e57 SHA-1: 55379ef9a4fa0aebafafff355031c87d70a55818 SHA-256: baa0273486d6df86c93c1f6535eb10eaec6ea64fb6561bcd778025a2e0798058
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=god+is+dead+book+pdf PDF link annotation
    • http://kammatrans.com/userfiles/files/63934312467.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/54313346343.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zetekudifo.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/rerekomomo.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/nusugalelaxedejo.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/80412191473.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nagipotuvepoxinal.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/320924ab07b784f964555a329c5ea5f5/88082783284.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/bonabevaduvuzu.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/toropizifefedoba.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fesexivajel.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/47483046933.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134228605d27---naruwijoximevoxesij.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630728457.pdfIn PDF document text
    • https://funbugs.ie/files/file/jakul.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/nufov.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/92978923430.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jorometolimof.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/20441245927.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/93777792583.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614006c1ea579---gagitewuritunekutinomu.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/jiguxawaj.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/sinejom.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_off0000b7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 10412 bytes
SHA-256: 9ec1c70efe9a15e9883f8cfb4ab1a4be2b93a1b7300ab162c8efdb3fde4eb17f
font_02_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 17220 bytes
SHA-256: 3afd377a14cc8155a4d5fa9d07cc39ee432b9024a84f0d60e1c81e140ae4456f

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