Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e17eb475e9d09e8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 14:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61d23188d17bb115c72b129cd09381ba SHA-1: c6ffd214cca9a9fc416f2db7ff2e693694fbbefc SHA-256: 5e17eb475e9d09e84b647c5154ef514cf5103b9cd09ba21c09543ddbd0d24e27
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The document also features a link farm pointing to various external websites, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely involving the download or redirection to further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yh-nutri.com/filespath/files/20210911074501.pdf In PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/zovutobuwiviled.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/kazepeso.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/vozopowuzidurazufuket.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/jujakajafafu.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/16496476489.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903134525821274.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/vupinodukabodolexide.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2fccb972fbd7e4bad2025be3022816f1/pelupodet.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/zuvuduzaganu.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/87041716213.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/65199463327.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae369a2402---66162524565.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/92994544175.pdfIn PDF document text
    • https://esvigo.com/upload/files/suxewisijal.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/10087638829.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02b4d5069---46387743811.pdfIn PDF document text
    • http://hanifeugur.com/image/files/lewoparowirolakur.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wuvivid.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/tanomamajuwegivaxu.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/bikatavebexuvozes.pdfIn PDF document text
    • http://cascad-trans.ru/files/45328767784.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/polezel.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/8566616589.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/vekazexeximatulufusas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=better+lottomatica+per+androidPDF 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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 10560 bytes
SHA-256: b16b017ea6aaad198127b66296d322d166becf219e60a973a456d89d0dd0ec25
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 18948 bytes
SHA-256: 63832c409481dcf4ca978f68307277354bebfa531c643ad3903b8dde5f454430

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