Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abcf407facf04da…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 09:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ffc39b72e19fe11b3a7713e87349a36 SHA-1: 48ce5c9ed0af7bde0f95714dd63d0fdeef8cf8f3 SHA-256: 2abcf407facf04dadeb7aa955fa76e1878f4ddcf5f3321521312aa8a455f0133
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dg583uupevenrvgf8r12bdi6j2/35520730901.pdf In PDF document text
    • https://giriconsultancy.com/content_files/files/viwarutowoxutunibozujo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607663b51c463---7031020136.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a990fcccc3---20800189851.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961fc677a28---simagazeludor.pdfIn PDF document text
    • https://fishuntpesca.it/file/janajarepifexa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c416355a---mozizeti.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/semavotez.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210728062827055.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/voxodibisemupuror.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///kixapekuxi.pdfIn PDF document text
    • http://vanhacollection.com/images/files/3614056074.pdfIn PDF document text
    • https://mollis.rs//files/7127763808.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0756bd059---juwunedu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/19686e8f3705cf4b5ba342fd250c586d/lukadudowibufexetiwovor.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3ad3d12f---53661333066.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kamufukewejeguju.pdfIn PDF document text
    • http://www.asslar.de/downloads/3428621022.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5c404724dc6840a5cd48fda014856c08/sivimelobodefusagudolov.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/2344430008.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f434965945---36552880866.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c722944119c---worevawumesajalakego.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8e68ea20e5e03bfd876e1b7101f9857e/tijorumadenubuzakumabono.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c8c17e86df1e49ce5af0fd00e45f9f67/98700417365.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ee4b0b29---jamezil.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/49332801656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mazda+5+2008+owners+manualPDF 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_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 11040 bytes
SHA-256: 5dc28a7331f129d75b15ab224cbc2313de9d956fc942dd9d52bc2f89b8a618d6
font_01_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 18216 bytes
SHA-256: 2421088ef8e13be0f004216235e48742dc30d66e4f4d21c5d7cb018eee92ea35
font_02_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1