Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ec205a83bb4fb3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 09:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89b089d443b04b87a1c30138520d95bb SHA-1: 80dc23c23e653cb3c18a7f762dd0d6860b0c99c8 SHA-256: 85ec205a83bb4fb3e9576362a6fe9598d703ccb33219343c73a17a1a72b77980
184 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 an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to trick users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.gyndoktors.de/ckfinder/userfiles/files/jajomavotedawosutivarifax.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161528f9ee0c0f---13117909079.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/24730582985.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/28336190832.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5080015d---pifajujun.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/kitodup.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/kuzuzidaku.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/40397619704.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/nupesotomasexesa.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/77635336688.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/mafixuverigorofob.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3e2424a7---renelajapida.pdfIn PDF document text
    • https://reniuved.it/file/josijoz.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wijobokifagufavodunaxuwa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4c20jun3286i065kclp1qqrdt4/87460381707.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109040543438675.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/24212704094.pdfIn PDF document text
    • http://juha.be/_files/file/tegixusur.pdfIn PDF document text
    • http://unityproductions.com/upload/files/94210848145.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/5175645205.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/ropafidu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/88617979556.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/11590284802.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/dilogar.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161494ef188544---kugebuduvuvifi.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=idioms+download+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 15112 bytes
SHA-256: c1f322956364d869d63a7696a06a092ebf50a5962c8075aa0f2cfc84c665195e
font_02_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 10368 bytes
SHA-256: de256287116857cf0a2046bb57c72e7cddf69a661e0a5d96fe4573aeae7682f2

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