Malicious PDF — malware analysis report

Static analysis result for SHA-256 36eb9619cb29cd1d…

MALICIOUS

PDF

84.8 KB Created: 2021-08-19 20:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ddf017376090c785ff05e7838cf1800 SHA-1: 16d10af65fbb24a28fe1daf23edfa411a7bdcc0c SHA-256: 36eb9619cb29cd1daa41b0e0fed858de0b44958e49822ad619702d4a414d7801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful destinations. The presence of these links and the nature of the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2u7vo5p9gu7a1bv8uitss3p3q6/15145352381.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/64aa1059edd482650aebefb712838d62/zizana.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e01667e24ae2e7cca41b56f4973b735d/tufikativuwo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa222210a0---jelujokagazetabegureg.pdfIn PDF document text
    • http://st03.it/userfiles/files/72220567526.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/7212948945.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/88304619036.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbfb23841---zexezisivatajabutopa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d5034d5c---faloluduwudesuxirisejuxem.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd9d9c86b---wujibu.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dasifunapiwitakuligogoge.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899f2a51c82---98287618178.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/75917800343.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/tasenipolulakubomevezot.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/40617e2a133b1896fea3c490db09c163/juxofatopelo.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/gobotigelumufa.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd6c20c2842ad7cd39247ff1fd4b996c/jixarir.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/64981781646.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/19724098231.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f39022503cb05c2d20f8f9618e075015/54226775656.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/39850772703.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/reditilosazurodufaziwamel.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725633aec3a---xejosoxedefopif.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/gimupetejufuvelazefu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a5bcfdf7---mexamamisabotivodikopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=electricity+and+magnetism+purcell+2nd+edition+solutions+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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 17660 bytes
SHA-256: 1dd2c2a02858610172ebb44c1605e30b7aae11505797b8ec416a491a85e35ad7
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 11280 bytes
SHA-256: 70f4bbd5c4d79a471e244444dcce8282010e6a41f1b9a1aafe4c3d1e67b3ffef
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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