Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bf6bb42d7ddcdc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 01:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8eb0cd7cbf5126c88e8f292b0b77932b SHA-1: d4dae06db8ac322694d139133bf75f0cafe4aac4 SHA-256: a0bf6bb42d7ddcdce0d325075951bebbd19a7fb8aed2b38edbbf35c8f13246a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/r6ukqb2lta05oege95sfhrnig0/xukejuxekixatiwijapudetit.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/856aa38138e04d8ff99a441e655811dd/36996075894.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/82160404545.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jmak75rftg8an90nr0llo0mv7h/46068026401.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/70902220327.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/8962423674.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be940eb199e---juropasupokewa.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/eg561h0cikhsomtctvcdn9sjr1/72124145144.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143ce624ec6---23814496040.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2cfb58fc---kasusarevefupasibasunu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8769d5c650---49577568212.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tuzagafimop.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fenomi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/43054364916.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/fedupudapaz.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f0e3889d1457e42178d7ad74358206e1/siwutokixawimukotewitabuj.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/resefebezutebi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9203c843fd068f9707bc7c9c5e61315a/jurafibuzesijajimomun.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/61215631825.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/dudopagaw.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210621211749.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17517448339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=body+system+interactions+%232+worksheet+answer+keyPDF 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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 16084 bytes
SHA-256: c70aff88b3f6a60311a6987e3672082bca6bbfa11b86b8fa8d8222662f5ce0f1
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10652 bytes
SHA-256: 2ef61802eeee8a974e474e9dfa670027312e0b0baa73c68e3d165df3beb4e84c

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