Malicious PDF — malware analysis report

Static analysis result for SHA-256 0959f4442f9ca516…

MALICIOUS

PDF

93.6 KB Created: 2021-07-26 16:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 444949ec1c7339c9671c9605fd3369be SHA-1: fd1f685afc00564730159657c0086196b0730791 SHA-256: 0959f4442f9ca51604169c8b9104d9aaaaf294650c2fedcd2ee34e6d96813756
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links likely serve as a lure to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://agrion.org/upload/fichier/80231512187.pdf In PDF document text
    • https://beautyyaurient.com/editor_upload/file/tanugeduminivuvamuzixa.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/87537393696.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zujoxanujogodawujujamonu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/53109078312.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cebf851ff3c575718307faf261c2ed64/debuken.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/lirobuwojaja.pdfIn PDF document text
    • http://centrons.com/uploaded/file/103878497060da1ddeaaf6e.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db07f2543d---mamujitovumapa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/rinoxutagopi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a543f40e4---76483254830.pdfIn PDF document text
    • http://elitvorota.ru/f/file/suzumoluwozeritapoxudab.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fitoxojiwowij.pdfIn PDF document text
    • http://firegallery.ru/img/upload/2808083971.pdfIn PDF document text
    • http://cmtsport.com/pliki/suwamujotojo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e446f70557---98807290251.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/letudiw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd3112c543---28612702475.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d37680240c2---rixelipuvowewisejuxix.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc624d907---57029910207.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/4027925936.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/011485d8015a1c7ef760a0f9a230a4b2/jogaturidibob.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/86760735949.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85108790722.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c13402085---rebosipef.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/92784521914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cac+reader+software+windows+10PDF 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_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 17376 bytes
SHA-256: b87e0324a5c860f6324023618344ec9f7c653dac3626959fe7f58ccfcec3d8c6
font_01_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7E 10712 bytes
SHA-256: 7ae9dc9a5886920567758970c355a4bf8d2f9a1636588a66d11930b6589b1e7d

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