Malicious PDF — malware analysis report

Static analysis result for SHA-256 73af5d296e3e0ad1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-17 02:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53c53ff4eeec20b0131dc8d6c4a110f3 SHA-1: f093a8d4ba96834e14dfaf01158569cd610f4165 SHA-256: 73af5d296e3e0ad11fbae694d5d67d406c0cd42a1bb362020120134be206bd6c
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, many hosted on disposable or compromised domains, suggests the primary purpose is to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/66f6f2a9eadabbf3a3ac1ef796e56dd1/27448904249.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71fb04dbac---gipumeta.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/80ef7evm16o8cga0nms1vgks2e/fanaxitonuxasezewefevufux.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/firobe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/78c635ac56e3ea41cffc46308661174f/kevitutu.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/ketabigi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp3qmabngovh4c39c74iqaa7ib/96775381911.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/39414429495.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r6khpsn0v3sd61tt847n1a07b4/23429631212.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0dff7a8e93417d9f810236a831a94bce/15684311598.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/lepunarujix.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cdda6763af1b0be786d9f6134854ca3f/kisipofaxamopud.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d03ac703---58638465949.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/popudedunezixij.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/motupag.pdfIn PDF document text
    • http://sakem.org/userfiles/files/85437273250.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9f0eca62c947bf031e3bd6be42c0bf27/porogubinujinanabajomepa.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1e1e3f23---vatawenutomamite.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e833cf7f5---xifuwixuzu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/24193730357.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/xapewomigapunepo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d6253e5c---neritip.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e90046192---disuxalavedexukuf.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/jikijorivisa.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/fenajenetonomawen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+apps+are+safe+to+remove+from+androidPDF 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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16996 bytes
SHA-256: a65da0697ace7980ddbfb2f82f9579559306f8d671da88ffb21b911d7b597144
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 10776 bytes
SHA-256: 465b847dea0b1e213009700afd56277e0b1149a139b10dba54ffd3b02792d0d9