Malicious PDF — malware analysis report

Static analysis result for SHA-256 244849aa8043bb6c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 05:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e56cbae7232cd644f3b016f903854fe9 SHA-1: ae6bfa2b140935c15795585b0c75399b446cbfe5 SHA-256: 244849aa8043bb6cd25511a853c8f51e576f0fc9e94260073d9a10d9ee159aad
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://olivier-daulte.com/ckfinder/userfiles/files/98383765886.pdf In PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/tiduxadadijegilube.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c3e7ce3ca---67788584936.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a823f0c5b---68634279272.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/ninafolisejo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/nugogilukitobesib.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc63b8ad4b---68794211055.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb3baac27885cf5f85b40ab64444be/25402923996.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/faxobuku.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/61731072844.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/sugofaxagovadukalejolod.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/c39ms85nuq4m4th043lnq1q0j2/28474957585.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/worizidifofofapi.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ropejafebozenojikanego.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/92268040889.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/bokatekagujo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c74b0c25aa149d37ea1ff7e125cbd1dd/52877127175.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a089cc042d46fc92b79bc3af2e3d7568/44037468686.pdfIn PDF document text
    • http://laduses.nl/image/file/fojigelawomugisowivovosu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd961bcac77---38511991311.pdfIn PDF document text
    • http://normel.org/files/upload/file/fewusojuk.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/53505608470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+unlock+all+vehicles+in+lego+worldsPDF 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_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 10984 bytes
SHA-256: 226d7e5756d3b763ed5370929024b753b6944a56ce81f6b523e2f1d60be48f2f
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 17692 bytes
SHA-256: ceeacbf5f4bb9ffd16a245f1440746595e6d45cd78a38b1fbbdd18f020dd28a8

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