Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b9659f72ef9919…

MALICIOUS

PDF

90.5 KB Created: 2021-08-04 19:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db460ef102ff592adfc211f45580f44d SHA-1: 9c12d8cbf1f4da88155e8cb73f30c866d177ccee SHA-256: 11b9659f72ef9919be277675addf996ecfe8c3011dfde8fa68caa862fe1f9eba
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of a 'Security software disable instruction' heuristic strongly suggests the document's intent is to manipulate the user into lowering their defenses. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it is designed to host or link to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d489ec89a7db4674a5e82dffbd94f630/zigixuwiwewerevunux.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/apbtfl751pber037ffl9ege1o5/42399278839.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zoxirinupemudu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2399049596---kividolawosebokolal.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/815e4fc1f941e1f6af72ad7e4ac12343/nuzalokubabi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/357c31c81e5838f3f8e68f42aadd2877/47880978234.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/13517474753.pdfIn PDF document text
    • http://imaginove.eu/data/Files/soxidamekufoniruzowubi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c2f3ffc2---xexexuresifitazuruzete.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719ffd57d36---89408411214.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/gabozedifisanibatasoku.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6du2kknhq73bfi25hjvvffpmsh/tuzixavoket.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/d5g5n2q1fhdbv0ch32t00u5vui/6628208240.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/63396766165.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/sukawi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/92607420509.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f2cb5afc---19842434904.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jugupekupibolan.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/kigenuguxibilofepedezon.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4f85a887eb2a0c3be186156835e80958/netax.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/zipegulisobil.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d404dbebbd---23446248918.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f4s746pef2ukn0u8vge7n53pg4/57757085065.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/35704228535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=telecharger+dc+unlocker+2+client+cracked+full+versionPDF 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_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17264 bytes
SHA-256: 53824e9b58c1ee26f02370c3214184c31ce08e8d4f447c7c5543b66feddfe647
font_01_sfnt_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 11096 bytes
SHA-256: a66b88e87d33c6aaf5cd078aaf62f4d48c34721077a414dfbae3fdc170974f66
font_02_sfnt_off00014265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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