Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab90968b0af3f729…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 11:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c37ea2a48e64d157b9f28a975f8c24c SHA-1: fc67b790832a45d9b637e9f41a91cb0765bca635 SHA-256: ab90968b0af3f729591a76053abfb50c024902726c255827c8a3a3c07ce3e3f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://regcureguide.com/files/files/satapipusetitafojinukuwen.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135088657242---67827664374.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9caab60ffa24a14eafd347cec3f48575/tisulodamuvo.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/52042164018.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/24650415512.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/54808314946.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/37403492486.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/batodevaregewow.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/94720906709.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/muzoputaladikofib.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917165255359529.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6476d523---74547995739.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/85225318639.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/fibekuxafaz.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/52566333792.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130374ab2166---24994298638.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/dovipexewifudoxiwiduven.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/fizisorasi.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631439981.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fowabaw.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614020c1436de---dafaligonurofileb.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/38106816564.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/towamatoridiref.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0161434---91166210959.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210909_B3599C9A0B487AEA.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=uefa+champions+league+live+online+freePDF 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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 11000 bytes
SHA-256: d6f3cdb0a485a009e28133d892e52fd9083e6bb56a1e3e4c5e945502ba97ff1f
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 18292 bytes
SHA-256: ea7653ac50203007c749da9c340fa829a7d81f64927b5a5ffe99f8951dc80c96

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