Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07e9949a240106d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 10:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8e5427160919c6dc69a4cee0c796675 SHA-1: 7322f1c8e7289d15c1a8fcc1b8fa126edef91a3a SHA-256: d07e9949a240106d7bb61bd42fd94827a2ef355906d60e8c38169ebf936998e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1a4664786bef86ee1ab060d5a7b700f/xewonenixep.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e088710025f7beb490b9230972e8515f/77005968655.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/71413072616.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8p2327ah11h1g4r3eq0c4teqa1/96079638323.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/03a241fb663fdb7f048fb9fe81f5989b/kujipowojowa.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9628a3fbb---lijilolusatunenudibogebir.pdfIn PDF document text
    • http://pi-consulting.ch/download/83140032474.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2le8ik1k5ut72rbnomorormpo4/34657568098.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160786e58722c0---50736184547.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/697599aa3a15fd449f8c9ce33222203d/xoloj.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/nidabifo.pdfIn PDF document text
    • https://quaint-house.com/68426690676.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/30645130790.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a737898f381---4774688495.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/36133333437.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e2b95590---dasisore.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/gajetamimukaxuviv.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/xawukipikibumobiduzexutov.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tunakelet.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a4ojj838tqgk02ii8c0f0bnik0/88348086707.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/66438660975.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/roruvuwusapapadev.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb547dcc2---44960271139.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/nasararuzokuteviko.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/zuzugivuwujawomedatomer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+pivot+table+excel+2007+pdfPDF 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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 10928 bytes
SHA-256: 01f0f6e1f3c9c774460bdf6e09842d517dade34fbea4ffe3d99029b9856561af
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 17480 bytes
SHA-256: 50d1be5e09560fbbe3d6bedcad8e3d0714946966ea743f5ecefd6b2b19e95550
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1