Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2f2cb1410bd005…

MALICIOUS

PDF

85.2 KB Created: 2021-08-30 13:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b346d99b25670d03ce32062cd63308c9 SHA-1: bff6de24e92edcf4ed06e219b324da4dc8b6f3b7 SHA-256: 9e2f2cb1410bd005019526fc58166868f44b028d0ff179e8bee7decce1d23087
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to lure users into malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=justin+timberlake+what+goes+around+comes PDF link annotation
    • https://jodhpurtravels.com/nbloom/fckuploads/file/jutibawejamuma.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jhh2ktrnqj1r0ppd9uc5tktqbn/65873464911.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wuruvexobutag.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/sumusibeba.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b1f0683a2d0ee982fccba1e4f8910141/68492850737.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16288412331075842098.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/dokolilidefokudavak.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/7720616081.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7379b0a18b---19470690737.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f26cffb6a8054c92b7f84d7c8e48df98/pulewopajated.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02bfdc3e8---43130404725.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/tchqieinhehaamacen686rgdku/44892438218.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/96893817427.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ca3e08f9299c9dcb69bf1c5b39dad713/92332865205.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/20030876036.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/jemefelunerigovowonov.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/womifujajugakusokuxed.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc2c21d2a5---pelowul.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/83121630254.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210623003632.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/62557533704.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca4045a4e---xusonaweb.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vsnk0d9f17plic5ov0ghbjjo63/68912826582.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5eb3e5150f59524ec541035b2bc1ac36/worosomibejaguvitalim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e667.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE667 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 11224 bytes
SHA-256: a0d67a88e0198aedb77488f81e11952fc2812bd5b1a00d660878d111b12eefc1
font_02_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 19508 bytes
SHA-256: 2d90bb98f61d65edd747cb1f4ed84707ca6ba1e81ef1bbbd18895fa67ca4566c
font_03_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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