Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea671185bfb0118…

MALICIOUS

PDF

113.1 KB Created: 2021-09-06 10:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 926b0f124a3d850cec0b72feb4c9edfa SHA-1: 73536b43772ef483f833d0607631dc64759e24b7 SHA-256: bea671185bfb0118b803c83dea55355d252a0d9d25100d36a5f35e21632d4910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a link farm with numerous URLs hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=chicago+manual+of+style+hyphen+guide PDF link annotation
    • http://cloverdiamond.com/file/nukegovovosiwivizokenina.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/89124185759.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/21714070355.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4c13c27e1296c81784891fb4d3e5ea5c/gigizugoputuniluxo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/lupolevaverat.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2qctnhhkfkplh74pr057l2nr67/60782775147.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3eim8e3a5vfsulqpckuqnbhlfp/92151060498.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd944b5f6ec---zesajazevebukavidotolise.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/nireriberafitilumebixa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9225ce05d1---libafamofubise.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/68219c0af83180f9cc77b267d993c171/xufibaxogebozido.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11b7fa10e69f7bf3c174693eeeec4654/bulewupaxukixubeposama.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/97489497058.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/50134489615.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c538269b0f5118db779a279614b127e3/76249924566.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f6cb9d422dccf7f36c992f58d67b541f/pavedovasuzimokipizokek.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/74938524185.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/zewunajok.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/89260781264.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nulumirotajunuti.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_off000151ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AC 19560 bytes
SHA-256: 7eaa5d03681dc516b2f777870f48a99a991c6f33579a9a8af359faa9258d8d37
font_01_sfnt_off000184f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F0 11212 bytes
SHA-256: 19a58140a41f82d742025943241fc03d7500e30de8b1cc2389fa3d38188ec49e
font_02_sfnt_off00019ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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