Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c593ed06a9b54f2…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 00:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01e712afb66268d33588135b4f431980 SHA-1: f36255c5b39ac8ca0d01d6d3a97b967abe323fd4 SHA-256: 4c593ed06a9b54f2fcf088968e1fafa02d8e3349b6160431358ca57c09599b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests the PDF is designed to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://artbaget.net/admin/ckfinder/userfiles/files/57030996647.pdf In PDF document text
    • http://natproperty.com/userfiles/files/27009104924.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac994aa17---rurawekevadedog.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/bizezisozalunakogub.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/90831791651.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/14797596822.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/fenav.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c5ae86e331e88ebc37b717b75c80bd22/66793988931.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/bf0b23.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb9b26cd4b---tisote.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/tavoxuluweromelapifozir.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27042116179.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/jipaxif.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ehpbmv4sahpuqqvd7rr9p2reet/texobinedosupi.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/96524974592.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/zewajebuvojevegudasexot.pdfIn PDF document text
    • http://storemisr.com/uploads/files/wiline.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-25/20210825040243550941.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/memavogim.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0710a8409---18711010697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=animal+idioms+worksheet+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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 17848 bytes
SHA-256: 604c834f00333149aea176ea24ca8c031db7b019d73cf791ec9e07c36f2a5bd7
font_02_sfnt_off00014214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 10920 bytes
SHA-256: 0f42877ca7796348b829bcb3ee53b07038255892c3114f6ac1f4fd7a179e0781