Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8ee839bde9c972…

MALICIOUS

PDF

76.8 KB Created: 2021-08-15 01:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f12310acc98afd926da63cbcede6038 SHA-1: 90a927a1f7606590b2119aaea77b3e8e833f414d SHA-256: 4e8ee839bde9c97247abd7e7baa800fb8111216331b0263d1cb9be015ef074c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://esrafisek.com/images_upload/files/58437428651.pdf In PDF document text
    • https://flardochform.se/userfiles/file/50356766057.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/tekoxudujalamaxod.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f5d4d064b3cfe98fa4f1c7466a995788/7724123569.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/1672233825.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/vomegipejazaluwifomoxir.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/jamubutubufididudutuju.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zekobutopanime.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fd19e22---xokeduzugovotelilititowan.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608536ded8e21---buneviluguzifajolesipaxo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161176e7a07028---pulegufenexevanabijiw.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/98308897031.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6e7ddc48---19140016838.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vezugazetaradapid.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160765b26c9acc---walejozumuga.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc35ed1483---7908487420.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/aed7e81ee0b2039c881a7d85bcf42c1b/ropole.pdfIn PDF document text
    • http://446888.top/userfiles/file/gegap.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a81846c325020799e0d50ce7a3084871/ferijaxibijoxuxerogubibat.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/44147364728.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tupebesi.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/toxobevelapulenatobiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=libro+del+maestro+desaf%C3%ADos+matem%C3%A1ticos+cuarto+grado+contestado+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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 16272 bytes
SHA-256: 4d78ed2a4abf8442ac79cd363b045cd76fb999c0f5fb65d69dab0049d2e5d9f2
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 11404 bytes
SHA-256: 13b5ba09cb2cd66cb67799b4411135556cc26e7bf9ae36cfc66d98d71c153cda

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