Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c4c4f11f92b762…

MALICIOUS

PDF

83.1 KB Created: 2021-07-06 20:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f3cd82b9fb3a864cf0e28f5bb2b67198 SHA-1: 9f0a21d76e2f202194158baa22e7a4a3a054dc03 SHA-256: e9c4c4f11f92b762aa63d67caa6128a6b0965c5daaef1267ae1a6d43ece98822
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=class+7+science+chapter+3+question+answer+in+assamese PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d065e693f0---jaxirugosowazimukikob.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/56ab4335c324db407b7246c799c86f56/77992157790.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/14089678153.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/45576068875.pdfIn PDF document text
    • https://tl-systems.hu/files/files/26392860774.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608885426a285---40613275088.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nubugekidus.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/7leg306mncekohad4j0668k0oa/kakiximuva.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k68gi5sh36pb90uh6eohjgbv36/megepifiwoxuxaruven.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ded2be064---renugewowikozilopozidit.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0d5aa79de6e61fbb0fda2216cc03afa0/dimuwijari.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062122315973499.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090f753493a0---dajegal.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f63ca85f4---wujibananuwofuratavimaza.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1f5e07ff---donizogawudofenilumig.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f3a98b12---23261442682.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/242d97ae9b3fe3b8877f13115fff0544/91098124537.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/vazanamosagerorizidi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d99c065c21a---vavobevajo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bda83afb---80189453351.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb481030e---65602572695.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160874639027e1---kipup.pdfIn PDF document text
    • http://fygl.net/uploads/file/110943469137.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s3hjv5dfnb1mk4tfnu3pgpfv83/ketarevulosupune.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/22389755797.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/fuxojunifiwugofebexalubob.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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 11224 bytes
SHA-256: 14bc77d7da749b38363f95f9b602a48c19adf4806b5c92d230643dc4b665fe1c
font_02_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16672 bytes
SHA-256: 254793602ddaea7f72a2005415395a129bfbd51ea3c26af53fb345be429c0422

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