Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0b45b54a8d826c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 23:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e83750b0b96d410f4d61195f258a5ac SHA-1: 1e74f512621b79679379e987c736149155e9111d SHA-256: 1f0b45b54a8d826ca9f5ea3038fd2e706cc80bbe7ec3cb3cc2145e313c0a4115
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely intended to redirect users to download further malicious content. The PDF's structure and the presence of embedded JavaScript suggest an attempt to exploit vulnerabilities or trick users into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://smidgel.ru/uplcv?utm_term=shri+hanuman+vadvanal+stotra+pdf+free+download PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609473769bd93---23181801662.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dcb82ea5---muvanadaviregu.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/visabuwusuxorirerenoxe.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/jorefurisavav.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e94f74009---69568912376.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7346a7647---dufolosiwexebegulo.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051410362257.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/wixaxinusumane.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/zimiza.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ek1knk2ti3pfakjqnfu6v8uccs/bitopowamorifote.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/24e7c35ee98b821675f6e3305595e406/48374525717.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4809279a---dituzamuzemaf.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c84a8eca4---putidotuxosafuganilo.pdfIn PDF document text
    • http://novafish.it/userfiles/files/sisibavama.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a422826cc5c---83618302659.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5408df405---73122923005.pdfIn PDF document text
    • http://kalikraft.com/images/file/28530270195.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1dba1a9463d78694a2948405f16ea268/70697099893.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d4cl47ni9rd62jh5v37jogkj04/3860395180.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/68635182248.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/9202239222.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tidutomixusad.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce9114ed7---pumejepidit.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_off0000b4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E1 15416 bytes
SHA-256: 8cb2b5e48ce91434be6a8a3b7ad16bab8a7268b507827dc385d04b1d20c8067f
font_01_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 11092 bytes
SHA-256: 83767c39897480ff62e3450288b57fe4214e272f9cd6dbb49e32d806d847ffca

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