Malicious PDF — malware analysis report

Static analysis result for SHA-256 721acf1b6ec4d9da…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 08:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b0908c6ac4642bc79ab642a3903de52 SHA-1: dc89e17011df5bcd29cb24eaf2047f9d277a3e34 SHA-256: 721acf1b6ec4d9da04baee8ea7aa1288a5426b50e96541d96589f64788c5d702
172 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rollfactorytogo.com/uploads/files/54559384906.pdf In PDF document text
    • http://pm-property.pl/userfiles/file/voxawogakamezosari.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/93716031640.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nijevokejunupomidek.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wawenel.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/bigetulevipeg.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/39670551217.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140208f4a59e---35316616882.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/rekufonaxer.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/fukus.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139e560e1d52---78421873186.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qoqk85tti96qgjs4ecdq3vec7/vuwirixajis.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/sezefudi.pdfIn PDF document text
    • https://eternalbliss.net/file/17564078402.pdfIn PDF document text
    • http://metallpress.ru/files/sozugakipunosuza.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/41938844847.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/lawegib.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/44507410096.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/96305003060.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c0e4535d4647422789d5d09bb818ac38/sedenitamiwekel.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/kiredipifudizunasora.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/pusosizofitutilonuba.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tukunorominesilumokozak.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/negamaravemabeterina.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335da2159b5---75446148303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+endgame+for+freePDF 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10608 bytes
SHA-256: eec2563fa749610457aa285449c0172aad63444bf9e99326a0b9ca5105263da3
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 18372 bytes
SHA-256: 0d9df6c0aa0aa92a98e086adff4c00789ffb6f7c53f762447d143e9537598b40
font_02_sfnt_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1