Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50031039e20fd60…

MALICIOUS

PDF

90.0 KB Created: 2021-08-25 13:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4791f30b287b6b07337973ec242c50d SHA-1: 1769d1b3a6cff3ae761279be13d29a24df55b1f8 SHA-256: e50031039e20fd60f349695006e084b6df33bf7b2f78738c425c782c35ff4214
156 Risk Score

Malware Insights

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

The PDF 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, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs, including one that appears to be a redirector, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://talcmanagement.com/uploaded_files/userfiles/files/22861071238.pdf In PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/57136830049.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608821745d5ed---68605122389.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/jobowux.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/gikawotodebe.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/77253703840.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/689d006b6f365445b7a99dc876c16cae/fawurozufisun.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/jinewasagidonopajexuvoduz.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/runakukifepete.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0181e45920808463d633452d29253b2d/bexofaj.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f551a99685f---47269783676.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/zofeselebosutojat.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/47901709430.pdfIn PDF document text
    • http://grupophi.es/uploads/files/66117630556.pdfIn PDF document text
    • https://yasacompany.com/upload/files/lededatu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/75201726942.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b37a86139---15302377208.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/xavopivuxopobus.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/lf2km40ft7bl22e2nvqd7m2vnk/zarivewapalusutuponos.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0f06791319c1dd954c023169a89c9efd/difoxupepunovedimox.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/48d0cd6c83696081ecac1a609447ea32/91567854139.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090583846255---18827531740.pdfIn PDF document text
    • http://klinok-saintp.ru/files/74630151371.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/diburebujozilosipepala.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58104897729.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/13202804371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wolf+of+wall+street+full+movie+with+subtitlesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 20144 bytes
SHA-256: a069fda3eb0dc6f6eb27697df231675d226a9e5a9e35a1c95abcb37ecf2ca079
font_01_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 2704 bytes
SHA-256: 19e3379701295a0d8b1a96b2116ffe00bea3cb63b846bdaba66634477f089a82
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 10760 bytes
SHA-256: cdb62789a2c883ef47cd206fc19ece71d14bda1c94237b64e3f521ee8552086b