Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e6afd3d7ea465…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 20:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 28661b9526232640581219668bdf82b5 SHA-1: 3fb126895745be80375423fa9c584e6360904773 SHA-256: 3f3e6afd3d7ea465544ed763dc1cf406691b9bed7fac5b32522f6285b65b7b2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://pistant.ru/uplcv?utm_term=how+to+make+android+run+faster PDF link annotation
    • http://studiotecnicomaglio.it/userfiles/files/53224506412.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/nikajizekazolimo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xetikapojibapofanuraxivov.pdfIn PDF document text
    • http://polipack.ru/content/file/33220822091.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91446c32b---95910997586.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dujumolas.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///tijerumituto.pdfIn PDF document text
    • http://sooclose.eu/upload/File/ritij.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53032661003.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dogudidafif.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/velapemebomo.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/ratawukelulorom.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/72185505885.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/79649992864.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/21164342879.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/zonofin.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/vefajudan.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54177657748.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/votedepevajilifefe.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/43291970134.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/zepalowawuwujomusi.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/kavatosije.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109121654355824.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614100c9ccdc5---roxowutulununosexop.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366287ad76b---digibebenabimada.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vikipulisumofurovi.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gozobolifenegimu.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_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 17092 bytes
SHA-256: 868b2c3d4cce8621e60272f107bf32712cfedce63a8f7a7b866561060dfccca4
font_02_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 10736 bytes
SHA-256: 4af150198df84f2927298687bb869e5d7a1e15c13f99635a573fbd8ca21bb52d