Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c0161be3fad8f4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 04:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f45fefea49b56e77aa0988a68a3aae4d SHA-1: ed312851ceee7d805e0fb451b5ea7438715959fc SHA-256: c8c0161be3fad8f4453a04d53dae0ba432dbde991788771baa9c4a82d171ff61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly indicate this PDF is used to redirect users to malicious destinations.

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 http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3b3218e4---3904110470.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/6661956101.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/dcd138453543de5555b2b1a677722e13/27735003790.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-17/20210817195650914186.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/deed9b330ec088cd858f41f9bc02c2b3/50556784120.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/javatimifadolepelu.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/gineboralewutixogur.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/bbae4afb74f04486413bf37e67e066a5/18182900512.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/16398724096.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/23611191801.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/fepabutab.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/fuzalori.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2557a6b134---jukenin.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/26770990901.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/36027095076.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/57397550510.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/zafojevu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bfe5a95a22a946071a1bdf7e937134e2/ripojojoz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/n0neb2rdummsml7ju7154l97vr/50929884138.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/82609223345.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/46180714509.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/111c46bbee4618a1eca64595601ac68a/63983366647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pedagogy+mcqs+for+sst+fpsc+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 17704 bytes
SHA-256: 07953c5040ba2c50760b296358aa1e31badd0060ea0df756cea31397dd5ab658
font_01_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 10980 bytes
SHA-256: 1f876216d23dadfb18172c0344a176aaa40a67d439d2791c8b4add846ae198f9
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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