Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71cba9526d4eda6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 06:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d24e727ab1c42bbf4cb8580b607da9c4 SHA-1: 6137156db3aac671d5af61091831831cd9f8a7c9 SHA-256: e71cba9526d4eda68e1d8adae35192f941fc24da1c33e547661217fb9364f27d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=telecharger+jeux+action+android PDF link annotation
    • http://anninhsieuthi.online/upload/files/fumomikakibugofu.pdfIn PDF document text
    • https://maymac.info/userfiles/file/67222237681.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/xitatifejogaginon.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/90584594916.pdfIn PDF document text
    • http://schokobrunnen.com/idata/zidototo.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/76316520684.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/tataludefuwasin.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/89647485089.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/fowiwimubev.pdfIn PDF document text
    • http://stromzeleny.cz/file/fopazoleje.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/sodexebezor.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109131632355487.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/96355688711.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/44677623367.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ut7o70fe8ccokgkgvc70fm3ri0/84343045329.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/45688355702.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/sovebamifitowusufa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/adbd30f774021e647f85fc227a5c4e11/25705214640.pdfIn PDF document text
    • https://htchninc.com/d/files/teluleneroxunaxu.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/66453249084.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138583b7444b---joboruredunejomas.pdfIn PDF document text
    • http://tyextractor.com/d/files/72203265568.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/jilekatogokadem.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/tugotofedi.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_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 10776 bytes
SHA-256: 94720acf2626c3abd9ea8cd42f206349d23d4283aaedca124a42131717eb1e37
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 18664 bytes
SHA-256: ff48c290f0df1df9e187a98f872a365423f0a92c493ea84a2b803cc4da7102ba
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1