Malicious PDF — malware analysis report

Static analysis result for SHA-256 00abdf51097d9f3e…

MALICIOUS

PDF

70.4 KB Created: 2021-10-12 09:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6985d506329e90bc28be1da5782b090 SHA-1: 6dd22bd8ddc47be60740bc15edb59df6e639f233 SHA-256: 00abdf51097d9f3e64216a3ffbbbda02b26b060bf3f4c9b1218e4f94b133f495
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm hosted on compromised WordPress sites. Embedded JavaScript streams are present, suggesting potential execution of malicious code. The numerous external URIs, many pointing to compromised upload directories, strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/379e7e96d10b8794b7d439e0b917a26c/64485988072.pdf In PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/ruxologeto.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/58492346597.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/detilozuvujefarukozuniv.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/57843779738.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/varebubiraxebuxak.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/97456760939.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/mewawevotolus.pdfIn PDF document text
    • http://cobmedia.hu/include/11553572812.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f6c54f0ad6---juwafekodow.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9af7f39fb4c4a2c538244c9008be8e53/danakuxubenagiwelibojuve.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/xibagasanezozegunad.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/tikig.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/99410699359.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/gobenuborek.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2a869ec50a866f337eb12c09dc1d260/nijijezefuberazunotomaxa.pdfIn PDF document text
    • http://test-immo.com/file/tepomatopetisosagi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wexifemivor.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2b791a1f130b4754fe5d7bba89ac643d/zitoladurobuxuzo.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/rerojisamupuxagiguxa.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/75641697421.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/3887229993.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/41831325789.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/xijedikemifogenivaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=how+many+eggs+does+an+emperor+penguin+lay+in+a+yearPDF 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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 14964 bytes
SHA-256: dc495e50b09b384417743f6512228c7c906f3b787b948b703bbd473a7a029cc5
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10928 bytes
SHA-256: 4e392f1c3ff7f067e4607f0ede5b136cda61daf83de636d5fda62b91d20e046c
font_02_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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