Malicious PDF — malware analysis report

Static analysis result for SHA-256 616c765be6d3fffd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 12:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce120272a7ff974e7c7afbcbcd8d4768 SHA-1: 2d745c167a790840363c5fd4dac471537816d361 SHA-256: 616c765be6d3fffd2960621146f74088451de19fbb3ebef27db039f1c24c4f2f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=demasiado+inteligente+para+ser+feliz+pdf PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f31d9891690d8797b1f9b0de2c8fe66/nopevuf.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915235712.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8eb5020f3cd7367528b3611bb1f6ae6a/62102914573.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/xezogo.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/54755156021.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/84782856618.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tutupavem.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/28639180073.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/91949679346.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/06b444491d062be08349db41a52af419/25292514280.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614836cbc8009---64433978996.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/zuwulenibodotujezolojibe.pdfIn PDF document text
    • https://kham.vn/userfiles/file/gofabulokalufeza.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vavepusonewipikejarawovep.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/bugize.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/vokupaturato.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a7f1b82---62351112245.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xafuzopoxuvejebasetevok.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/gigadajadenitizonaro.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492280204aa---lojexekejakulufuda.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/86053537385.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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10904 bytes
SHA-256: c8db27d99ec29fc29e58e3169d6dd4e8ab0296a837a48af57e2c182a9a7e010e
font_02_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 18584 bytes
SHA-256: 761d0a3749c76f7299566d15237b68ad5cb032b3b71dae5f811065338b93429d

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