Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b5f618a48f4e2a…

MALICIOUS

PDF

78.9 KB Created: 2021-08-20 05:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c338d9473ee400e01137c37264d108b6 SHA-1: b84daa2795c6794581771e12cf2b709fb2ad6fcb SHA-256: a2b5f618a48f4e2aef8260ca8f8a8cedc79cc1b62aa9b8f213a72af534ed0cb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=tecnicas+de+enfermeria+clinica+sandra+smith+pdf PDF link annotation
    • http://italianopizzeria-pg.com/uploads/files/91113094210.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e01d0aa2b8---29734289885.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/tuvunakelotibemosukuzoj.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/50291315301.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bqgvol3fu8hfvph2ufgvs7dcet/tagofubesu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hqdipfelfhja5jigcs7v1e1env/2964025490.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/2943174771.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/43cd64ef0efca435b1bb5f29e85f1feb/wugotovezitokuzituwanuwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46fe72f252---gisidajiduvaxefulemu.pdfIn PDF document text
    • https://gangnampools.com/contents//files/bozifuluwu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9l6hgvk6kv2d2qnvu4pd0tm6s4/wonegubakupopubezuf.pdfIn PDF document text
    • http://balone.net/_upload/file///takabowevi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/53627482354.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f9026162---nukivuwa.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/21f559bf23a95ccb575128d106097f42/76750521867.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ce0acd32---junepexozov.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/83678447406.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2d549e6a9a74205a8f4d4e7dd7c42f20/kokenorokomoweb.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fba3465cf---32752181025.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/dbad11f53c6f4d2b7aa276f7a9960a0c/xuvasedakipogexavuramal.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/kiwukexijebodad.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/nutevibemodaxuk.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/fugupobamaviratiweji.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/agq42m3hrblfpssrpbl96cq1i4/pozexuladegebasa.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 10728 bytes
SHA-256: 8fad82772ddb120998543e2f53f6089a319ce3a32bc731f0230e94af53b3e844
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 17164 bytes
SHA-256: ae55f7b17fb9379401daf57f9fffef2cf72ba312dc8f290718670f52e1590681
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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