Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d30d3adc028c411…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 20:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c27b3aad9caaf8082094bc390948162 SHA-1: 55c3c3b5cf5e2d8f37531afd6cd5d10c1f58a4b2 SHA-256: 8d30d3adc028c41180b6043d408b4a0c4e16a38f67f42c0e39d058fe0e88dd4e
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. This behavior is consistent with phishing or malware distribution campaigns, where users are lured to malicious sites via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://world-green-hope.com/uploads/files/86862031205.pdf In PDF document text
    • http://metafelix.it/userfiles/files/lenozivututoni.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/13285078925.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c9243fbe07bf2a9287fc7162495b97a5/9549322109.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5763ec2f8---11029857407.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be613112d04---nizifaxadefumuliveja.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/kadadexise.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/33370085629.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d0e3eb31---55482870260.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/68236665974.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/gigerojukode.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/54241665601.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/d72052408dabd42d8df0401b4cfc1506/12824931411.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/wovanegosuzizerisaj.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/pagupunijipunubani.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/wexuge.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/noxabeged.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/zibaweropokebawiget.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/logij.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/97727927716.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210521114448_1721943948.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/repube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tempstar+gas+furnace+owners+manualPDF link annotation
    • http://irodori.kir.jp/files/file/56798224604.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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16844 bytes
SHA-256: 9e74c35692cb2667a2668a6316e6e10315279972f9a96bed02f08d1aecbc22a5
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 10880 bytes
SHA-256: cb8cb7edca34ac4ffc8694c69f649dea6fc066c5a5e6836577e1c8fad5f0ff93
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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