Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffc56a068ea5a6f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 23:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a3f458cf4e41b5d9ba21db3efe2bf03 SHA-1: 2f893044fa957ae43d7f797a99a29021f06df95d SHA-256: fffc56a068ea5a6f165d0321b6c4de935f77469b79c26708cd0e6cb2b59cb0c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drironcat.com/images/file/fopezunuxulel.pdf In PDF document text
    • https://artbynela.com/uploads/file/zakibajadozivitiwamarukin.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/fufapabamitawenux.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/24773f6f1608a3a5853384808513084d/7765403649.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/xutalekizen.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/podulikiku.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52529161731.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161024538e61bd---10668305029.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/sopovo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf36c747f---67816487379.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b5c8ab19---lewarugudeziwesodikif.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://bioscipublisher.com/files/upfiles/file/kurewinidepowotoduzim.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/88615440935.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/37604352692.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/jafokefu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/nawit.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce49b27279---rejufamisefejenoliru.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/28786771110.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/xisinagavavogadexanalevu.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/kijepudenanizikuvujakafu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9de155e3a4---26891391556.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7u9b680cslu04qdk48tmpmat80/zobozawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=piano+arpeggios+sheet+music+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_off0000c10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10F 17100 bytes
SHA-256: 377774e8ab63c8e28027d12ee5473c84bed72764ee93f0acfaeb29e7196c12fa
font_01_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 11120 bytes
SHA-256: 442a3cc7bd7c17a7e41aeab3f20f9d5d295a81df2b58686318db4f77d06ab740
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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