Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6eb989413cee884…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 19:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8a81ac02f2d0a50f41e2f62d5e24a91 SHA-1: d89cbedb18acd3934c98d4dc5fe097a79e36beca SHA-256: f6eb989413cee884b387a0225a2e04ce02e5b4b6f807de2430709e1ce035525e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=best+dolby+atmos+music+player+for+android PDF link annotation
    • http://hdg-gmuend.de/userfiles/files/teruberiligew.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ujajagebojuve.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/kesolejedamona.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/vijewopu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff11de33f---rimarutilokevapafakem.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210917212455.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/61092831850.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/20584006843.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/19915429789.pdfIn PDF document text
    • http://turnyras.lt/Files/file/datipinibuseferuxewe.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/66891780648.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/27549737582.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xojenexane.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134256e87abd---28561281588.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/28667958941.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138de4a16d99---gewokomo.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nokena.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bupogigezebumuxixinubav.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8e919394efc5c0e05d9d0aaffb6a7441/gisezat.pdfIn PDF document text
    • http://showdoimovel.com/files/files/taloganorinavirujopa.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/15501902430.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/73977233811.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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 11188 bytes
SHA-256: 957a7f9784787bf3d1924416b71e892fe4071111b816fe20c6001866ed8f3b9c
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 17312 bytes
SHA-256: 6ae802ac8c4836222ec5e379be86af7085b9e8c92e6e45358d1a6929f862fb67

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