Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55a837bdc82a8f4…

MALICIOUS

PDF

83.0 KB Created: 2021-08-17 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6322ab3430c82f72b094ac37310da6dc SHA-1: 5b724635a03126e46ee2686b76403f6f106ed414 SHA-256: f55a837bdc82a8f4f2981de5277c024f301c3840d391efd598b90d4b55d40e86
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting or compromised WordPress sites. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely to phishing pages or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=solucionario+matematicas+1+bachillerato+anaya+2018 PDF link annotation
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijivojonametepefa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf73ea779e---dupusejunajokiwoz.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/rusames.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/4578782386.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/9501423165.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/bugab.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a5051dc7642b09f400c8fa30a484aaaa/lovesisubilida.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/rufosuduwetotiz.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad8406c813---zubilujebivasanoruvamalaj.pdfIn PDF document text
    • http://meskerjager.nl/media/files/70814055825.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/22846343911.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/puwekilepibe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/grj3aoert5ca6s4ul79soqtsuu/vusaxesafaronexoxonuduxa.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/13179755800.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160faa2b5884c5---gipivuvebajewewo.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/niletote.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/52742369903.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/21465011195.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f25dc324---86283425098.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7dd29ed10---92477281218.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087225e6db81---sizurunerutizin.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/dilerebekuvugamufi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a66980d6b---pitewidul.pdfIn PDF document text
    • 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_off0000db34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 18376 bytes
SHA-256: e1cb8a101f780c35169970a1e1e1ae3bb7ac6af0a937d141faf69b8859c96bf7
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 11428 bytes
SHA-256: 967519a611a2a24fa8739915c72d4220977aeb66c5d946fc1b0f05fc9709d563

Open this report in the interactive analyzer, or submit your own file for analysis.