Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f35c13c1476ac81…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 262e2fbc660b1c4ab5c45ce3f81110da SHA-1: bc2fc5775888329453479245e7c23c054abff4aa SHA-256: 3f35c13c1476ac81929ccced1b40ec1bae4d12cdc832d6fefae39d85aca3a7fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ucity69.com/clients/861769/File/72042842510.pdf In PDF document text
    • http://vodova51-53.cz/files/54007038605.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/51523069543.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/172210309639.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf0a0c525---tupubazedezigoxutef.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/nigiwute.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c6121d3168cbb29de72a223198243966/350582460.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e6e7e4c9a---nidijijopabisugevebepevi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/477c83ed8065f88d6d0e459981bcf714/56126143051.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb295d3d65---fapogimofe.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/jivofufani.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/wonamejutujafuxef.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8895627ba540c0b77f74bfc09d42c624/24375324571.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/74549607659.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160872e16d5d85---lenuvikojoxaxu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mepopazatasudezirix.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xaduvokunirur.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/kokisikowedutatamada.pdfIn PDF document text
    • http://silver1979.com/upload/file/nopalalasedemixolepiji.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b9ad2a0e82d204c83e401425bd8f9cb/50942007760.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/58821061693.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c8e5fcc3---55063629009.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vlg8vv3jo2rc9nr2fb7euq6per/76073247249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=adding+unlike+fractions+worksheets+pdfPDF 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_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 16280 bytes
SHA-256: a65077c35278659520700406ff0b523f6b0722cc10fda28cbe2254ce05a7f5a8
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 11156 bytes
SHA-256: 87e2e8187b6ebe2c72a773158dc8aa2583b293f059997e52b68997b1d13d250b
font_02_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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