Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae4a5e386f57682…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 16:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cba38ce5dcfc5cf345db4f0d33344395 SHA-1: 373a26323be59f68acc5699fb9b523aabd302895 SHA-256: eae4a5e386f57682de339953a8d8d4bba3ca7d573736df4236fd1e5d7d388359
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting an intent to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=nvidia+streaming+android PDF link annotation
    • http://medicaldistri.com/ckfinder_files/files/tiguriluvetowemeliluzum.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021912720172480.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/45043338933.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/desajo.pdfIn PDF document text
    • http://ebus.cn/up_file/file/lerefejoxaf.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/37054247677.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86949117130.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/jomodufoj.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/reroril.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/57549747030.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/384e70bc0d238d92351ecd74ac6e7d82/60807897340.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/miwozesinivuvugifeje.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/wafediz.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/61232147684.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/92681535715.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/mitatupupigajefud.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51526985774.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/42066871971.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb55f3705---sajafo.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fosujowokapotodopowexuwa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141645ad6dce---33866308778.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mebibimetoxunotonavakajol.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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 10588 bytes
SHA-256: 1f45c4880f914cc4ae253f858cdfd0344b7ba45e18191233df562179f51c65ad
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 18128 bytes
SHA-256: 79bc22c940c49a1ea80825cb731c624faeff865c70cf870d0460044b0a50fc3a