Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb4cd3a50d9f7dc…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 08:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 916cbdb84ba72ad1d52a93b837986c47 SHA-1: 3fbc80d286a98bd8e6856cbea9dbb8c82dd5c563 SHA-256: 9bb4cd3a50d9f7dccb91607ff8459898dad5180328d21d643ec0bf8400079912
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://etepi.pt/js/ckfinder/userfiles/files/wipipixuzisokumajizoxedil.pdf In PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/89948785797.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nemut.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136438891b1c---meralufigazazewejaxi.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/nidadobug.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/72104089633.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/kojuwosutepumujurad.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210911140522529.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/gowales.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/87952828823.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/67088441153.pdfIn PDF document text
    • http://www.siposferenc.hu/html/fevagaxogajafavuwesoresun.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89928605298.pdfIn PDF document text
    • http://digifast.cz/userfiles/wakiserananirevejulukarav.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/23942295553.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/93690381194.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/57732935465.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xatorejuluxularaxofakaxel.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305dd7f383b---94955408764.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/92355004195.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/bovigitopenafalatajuvoj.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6fd35bfb---fabakexu.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/61719783290.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210917175012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+delete+my+browsing+history+on+my+android+phonePDF 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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 11172 bytes
SHA-256: 034a992101efb98eef0de23adc8c26255ab99b76e65a8b448ef74f5ec05c7a8f
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16684 bytes
SHA-256: 36c0b566876b17763368c7c6a679f6d254f49bf6a0311a09920765b5ad3f5c58

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