Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cedf0d4b99bb4a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 11:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6da424c90b74c8fe6f9ff6441074a609 SHA-1: 9c64039a88f6c13b8cfbaecf5e2c75373ce3ab93 SHA-256: d8cedf0d4b99bb4ad9d84bd5ea12b26a84dc6d49c03c7714d8bd6ad9839e1dbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for executing the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agcslohian.com/userfiles/file/pikusabojuzi.pdf
    • https://cafesca.org/ckfinder/userfiles/files/65557769449.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612feef4da397---winusejelasu.pdf
    • https://jagamimpi.org/contents/files/82864024896.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/rajivawenowewenogigi.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/sevajebesidexudumo.pdf
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/1893169254.pdf
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/1987538006.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161337a79042f9---lesovepam.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c0738e4d0dbad99f48a3efde11bcc977/wawavizet.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/vazolunabe.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/22187898694.pdf
    • http://massintech.ru/img/outer/files/79091426789.pdf
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/posofunavegevava.pdf
    • http://naviway.su/upload/files/73774958448.pdf
    • https://cartolmania.it/file/72249125356.pdf
    • http://gaishachuukobuhin.com/js/upload/files/ligito.pdf
    • https://dottoridegregorio.it/public/file/mufozoxinap.pdf
    • http://chiangmai-esc.net/user_img/files/wukafamuvajufamoxaj.pdf
    • http://yesilderecine.com/admin/editor_resim/file/25350553727.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161467ac91dbbe---24901109108.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/sebusafiripiwokas.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/sj89kq5ouc9b1auvtgpgdhtse0/rotiwodu.pdf
    • http://lahma.pl/_u/userfiles/file/sojukozo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=upgrade+vista+to+windows+10+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ff.bin
e8909ed125f7d9a9d3e5b05788e6f4dfad35071fdb125bfd893d9ab7afccea84
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 18292 bytes
font_01_sfnt_off0000f777.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 16792 bytes
font_02_sfnt_off00010f8e.bin
1ebe1ca55cfed88d0f10ec66b4a67e2592aa698943af328c78f63efd50c94e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 10960 bytes