Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb847f696359864e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 11:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4076ab00635254b9bb4ab08831bd7f4e SHA-1: d511032ba1fa7f0a9d78580262b2ee50c4bb4af2 SHA-256: fb847f696359864eae1d4ec1cfb86217532122e71dc7aac9f4bde6ba2815e5cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic and numerous embedded URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's primary function appears to be directing users to download a password-protected archive, likely to bypass security filters and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://palirna-frydek.cz/uploaded/file/66705286445.pdf In PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16784783689.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/31914060337.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/gifivipujumefesefumakusa.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210918_164344.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87c466b58---rovilududanuviw.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d5e88ce8---68187772887.pdfIn PDF document text
    • https://luminex.pl/upload/file/46472975411.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202191765257025.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613613245953b---tanopogufuwivepomag.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/79565727278.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/71250196109.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/folokuxabaxejomaraw.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/kebinitexekal.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/87095132007.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210904130657.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/sapoverera.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/bemobexiwuwobumetaregide.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/4473346952.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/mijibiwevulor.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/3694154256.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/kubaduwidabisa.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kutuzomuka.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/33021166660.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/96591301180.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/sofazetixodititojig.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gewifijuwinenaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ppsspp+wwe+2k20PDF 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 9944 bytes
SHA-256: d2fe4a7d0ff2d3a9167ed67f2bf183414521ef0af77f652d2d5b80eaa84802b9
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 17128 bytes
SHA-256: dbb905c9d181d206896588f3df4854952943fad8c34157992a1fd80babfe8627
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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