Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03ba9ebb691c8cb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 17:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9ffb044219c0b249e9595c1dfd6b745 SHA-1: 6578021f933bcc6d325e3310ae1ef4b101dc3ca9 SHA-256: e03ba9ebb691c8cb4beb6db26ba61869bee43df7c9afaf2ad5cfafc6a1ba7af6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=starbucks+app+for+android+canada PDF link annotation
    • https://episcopiaoradiei.ro/files/nixorokixelazugefozona.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/54180541013.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jatozotox.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/46512558814.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/pebetitevitaxok.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/27727335336.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31032636043.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/40824261346.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/nizenisonu.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/fugogonuvi.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210914192056.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50936230296.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/28394786187.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/letutogozuzujikugudiga.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/46801459570.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/65370768387.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1520d4296---sanelojipoxinukubuz.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mdlu3tg777q4qak5cqdrlqnk87/tilokogataredezo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea05d53e2---wibilade.pdfIn PDF document text
    • http://klenderbio.com/upload/files/mubaninolobegofizeriki.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b383bc6845bc131dd05279c597da320c/banovat.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_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 18248 bytes
SHA-256: 2c6167b30d00fa7b3aa6fe3b8ca944201bb38a63712629565c30aceb06a32c59
font_01_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10840 bytes
SHA-256: 74e530c69d93149d3d27b43c2f3dd772b4f087e622f7a35515e2dca29eba2766
font_02_sfnt_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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