Malicious PDF — malware analysis report

Static analysis result for SHA-256 790e1feed9ca58ad…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 02:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2d1b9ee26814fc3e6417bd1c9c91bea SHA-1: cd8457a86f699b4a94e26d14c30d5554d35dc643 SHA-256: 790e1feed9ca58ad811535e20a4543f0e7108d698edd5897e3fe52296afdafbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=mha+heroes+rising+english+dub+online PDF link annotation
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/migivujino.pdfIn PDF document text
    • https://highrise.pl/file/42339232511.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gulokosomugivevebejexuvog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0suprkotqks4vo43ll2smfp74/38300517331.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/39269651500.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/66374302067.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zejerubenokutabefoxoze.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/05/file/92875806010.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/niliritutada.pdfIn PDF document text
    • http://www.moyekolodin.com/files/92636647952.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161302e1019b23---zobokijikafebow.pdfIn PDF document text
    • http://goref.ru/files/file/sosinavesinatimitetazor.pdfIn PDF document text
    • http://poliinc.com/upload/files/mapazigonufekuroxuxazasat.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/sugaxolunilomevin.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f72bd5bec---77293880186.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/13652491405.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6141be34b5d62.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3a9e0545---vodewulaw.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9e108804---15106888487.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/79247295764.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/lulasojisur.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109080632161844.pdfIn PDF document text
    • http://vln.nl/files/file/73620408216.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_off0000bd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1C 10664 bytes
SHA-256: 558932e5527ff0ed08fcd5159694e9fc13404784e6581b27bfdf5396e0c6b637
font_01_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 19244 bytes
SHA-256: e2724b66c42d756f10381eea13d84a87c1710f291f7cddf31eb22febd648f76f
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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