Malicious PDF — malware analysis report

Static analysis result for SHA-256 802b71db584eb92d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 12:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40010251f0a13c64b82bbe691573c9e2 SHA-1: 79ac6d1e1b8748cac205060c4c4c7996f24c538f SHA-256: 802b71db584eb92d82eb3eeea025c05035bd70f904c8dfd11d92b94bbb6679cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=what+does+non+renewable+mean+in+science PDF link annotation
    • http://gmicropilotes.com/uploads/files/raduselotewigidaga.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nowewijelizat.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/mupibumijepakowazuv.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/67945304063.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/90506902703.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9edc4b25---worulijok.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/losozadod.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/25333845189.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/33969028922.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609262cce5361---19019732641.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/lavuwiwe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb05ed19a9---30592753751.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c0f6d95e40b941304b2bfa01ed05f103/razesuzafulitosizo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/59650714046.pdfIn PDF document text
    • https://rajakedua.com/contents//files/kavovewo.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/birabejuvalizub.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/78582791137.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/8532297305.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/48345313239.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/bupawuvodazakabikere.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/napelofarikukopavulid.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612528f8431d5---77562951011.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/woxojutalojesazabazimek.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607244329e8d7---jofepe.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/72663657528.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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 18688 bytes
SHA-256: 1094c928eeb1f169214cea927e4fa90f8ec55809eba18aa6389b1055437ddec2
font_01_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13108 10856 bytes
SHA-256: 59800f3b0e0cd1aa0540bd193d11dc5f8343bd0c06b79d87855ac90392839410

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