Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdb3f95266fca15…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 16:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b4d068be21232ecd5150eb5410db036 SHA-1: b20ba51acdea44ed327cca9cd17575365b290cbb SHA-256: 7bdb3f95266fca15e2e9ef0c1a5e52f22fc597c8b95d77f994a7172bce370f6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ohadalegistrocbarter.com/ckeditor/uploads/files/xebufenumalefozonurulak.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d87380f9d01b7e63da12fb5e962fed86/fugagopew.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/senokefigisivilazite.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133df6019092---89176070900.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vawamofotojevavavobatifep.pdfIn PDF document text
    • http://inica.org/files/file///wozupelusatemosigiso.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tupidanaragiga.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ripesaporelegup.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c61fbb9b8ba3976c17fd2988e5aa9c7f/1869533326.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6278eea7dc15ab7f89db4b633cd504d5/91805883604.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zugazesox.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/voxajixozujudi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0756f27b---moxesemibevafo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141145738764---boxepemugosatuju.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/pevijozelife.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/vopubuzutobivewuxejuni.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/39998534663.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/ditakonilojejisenir.pdfIn PDF document text
    • http://sakra.sk/storage/file/95931390313.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/kesubafujulajewafane.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/92986160090.pdfIn PDF document text
    • http://szpk.hu/_user/file/48304774791.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/wofokezuxibus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gamecube+emulator+apk+androidPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10880 bytes
SHA-256: 1a3e1c8da7d18d568503306a573c057668d541974729445fe237926cb2e7981e
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 18648 bytes
SHA-256: 96536b70927dda48ae94290e5531a0c54ce5e1b1f53217117f1dd5863e2ab900
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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