Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b94f5d169522a8f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 03:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ada85c2b3a45eec1e26465c912d43664 SHA-1: c588bcd0afc89e017a11bff6001efc39901b2800 SHA-256: 9b94f5d169522a8fffc841b398bd989f7248fa276c7390008e94f2cfcc279303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=pythagoras+worksheet+grade+8 PDF link annotation
    • http://capital96.com/userfiles/file/xavow.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dd6de1d00---11478334242.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gjb76qq120rasjkr55mr7ma1gq/40193917910.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gonesivinop.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/rorod.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/jidigamafovijifewom.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/20166976251.pdfIn PDF document text
    • https://nada70.org/userfiles/file/buxejikubese.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sjgcn4emodhkevmgi36dsohdj2/75869671249.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/vokak.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0fe3f1ad5bd5e1745200305437d78e1b/70291461436.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db67360e1ab---muwesojijisor.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/34415720579.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881b090c316---bixafisosereratejigalova.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/27578966369.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/31376232238.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nebopevulupunuguxusatofi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/92dca5e23b40634b1373060dfead0f82/zomidowasisewilod.pdfIn PDF document text
    • https://bagstyle.uz/images/file/lusit.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/jiluwidujalevegesugar.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5e298dc80db9220457e612aa12306dfd/sizuwowakifu.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/dejojiguwedomapa.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_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 17620 bytes
SHA-256: 63f282543a4f0dcccc35ccae2acff53cf69cc3d95aa1598c87d040574ce9fb9e
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 10788 bytes
SHA-256: 14443896152763b9dde48e575f30b907e5b4e799c602a9385ab14512e52acbcd

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