Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00acb4be132e129…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b6e3f4d502f78dd722d4a9eca1dd77eb SHA-1: 0967b2bd4fdfb6f81b2cae6eaf24fda22cf1e559 SHA-256: e00acb4be132e12923721f27be1575a7222d12ead5065aa8e85eedce758b2554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous unknown PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://arab-hams.com/Ups/files/89881458209.pdf In PDF document text
    • https://egokituz.eus/files/galeria/files/2019985465.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c6d958b1---gagev.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/43806955600.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d459be5f8---lodubovofe.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6f18f68b6aa982d73a4a59cf6e21a806/66260321103.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/71802604985.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25b1d729a---wimepojupipeg.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/ragizagi.pdfIn PDF document text
    • https://tsegypt.com/file/6466394677.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b4g4asegbta3hqmnkdu90ac7o5/tebezobuduvatolamoromupe.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/tudobekutaroso.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/53394910128.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/61824692463.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9275f108a0---puxuvoxuzaju.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db113887e6b---46778878621.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/98261082549.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ec360ebeaec8ad1f36234dc924e86095/lekixezefovi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6ee906c7---juvexol.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4c0eaddf3182a94514dd9d93b9a5b59f/32622300018.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81559595441.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849fd32e2cc---88374403071.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/dalidaxawaselizijomisuke.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/610e844d0313392b6eda6fc129cb01aa/33789236879.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/54130596009.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/dovofudinid.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/52667460682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hyponatremia+and+cortisolPDF 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_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 17652 bytes
SHA-256: 2a78b3a33c955592d72d4e9cec84e166a0fb0eeba98f32debae2b1d7b0ff1b51
font_01_sfnt_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001448c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448C 10780 bytes
SHA-256: 856d2047524b49e9a0356453cdcc5bec104fd543f5e1c724d0930fb887d7a6a6