Malicious PDF — malware analysis report

Static analysis result for SHA-256 648e576713cabcda…

MALICIOUS

PDF

80.1 KB Created: 2021-10-06 07:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be4a2e3c04ccc69bcb40861ad7206816 SHA-1: 661d3be6351cccecd322d846b2eaf50360ebfd16 SHA-256: 648e576713cabcda106df389d9eff5374db24c4de0069646fa27500e2a9f34bf
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mifovugofezuvo.pdf In PDF document text
    • http://dent-pro.cz/pic/file/modokapuzekaxurokagu.pdfIn PDF document text
    • http://woykoff.hu/upload/file/metopilubigo.pdfIn PDF document text
    • https://brod-plovdiv.com/images/21059691606.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbd8284ef---82468193978.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/65986662145.pdfIn PDF document text
    • https://adikkedua.com/contents/files/25999933648.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jizawitatijujinetosavo.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/sanof.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/19437592584.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee54242a85---jusubinumesafexogo.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/51056792448.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf302b6c5---navikofunipusiwen.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/69413259645.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/xutagulaw.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/36201060491.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/wuxanezimozatodadurefif.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/18441491502.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/74517295327.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/90014056945.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/59220182139.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/77525822413.pdfIn PDF document text
    • http://cssh.es/img/file/bazobozijeluzupefudutuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=happy+new+year+images+photosPDF 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_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 18756 bytes
SHA-256: 5689450c44f14287019de9094da2651877f40b3ed8c17e3e0a86d50067ab55f8
font_01_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 10844 bytes
SHA-256: fb143f322de93b08a74027d632c15a50019c25b83cc6090fe3cd9c7bcc4653ac
font_02_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1