Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ae79cf099e7197…

MALICIOUS

PDF

70.9 KB Created: 2021-08-27 22:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcd91cf1c07403a4076944b9d6aac195 SHA-1: c0d39586fc6fb237398ec130d8a1f6c80def8c40 SHA-256: 92ae79cf099e71970c9c77d1f55a4280ce14a80c5efb6f0e14ffa60ed30739d3
164 Risk Score

Malware Insights

MITRE ATT&CK
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, likely to redirect the user to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=quick+play+trap+cards PDF link annotation
    • http://tanphatinst.com/vietkiendo/upload/file/xefirufujuvanafuruve.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d607d389e386ac960989d9d2c1330e2a/gajujeve.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mqj878pp22igvkcin7r3892fs2/wixavuvavupetu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f05a8c17---23511949333.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/ledugubijejarodibuwijinu.pdfIn PDF document text
    • http://talenthunt.biz/userfiles/file/medis.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/70693620898.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/50209952491.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160762597ead24---zonebepozomokifolomefis.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202163065645620.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/ludukagebekazawunew.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/53087154851.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/vagok.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/57047448892.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea3a5957a---vuposilevulanopiwizop.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/33e03f95b51c0226cccd5913eeb625f1/13365722866.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/38129631732.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/doxofagalogorokekixesedom.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec76cc54c1---bomixorixuwiduwepepof.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0rufjk8pnhee1gqn8cmcs2702q/diwifumonufuputimukutul.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/xukamozawafufikewigarazi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/tikomorino.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8052e02272---babofovofijolojub.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_off0000b6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E6 10516 bytes
SHA-256: 8dbc49b2d873e7224ed46f4e375160391ff03da3692f1602d073d44e110a9220
font_01_sfnt_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 15276 bytes
SHA-256: a5a63fcdb392d052ba5c007dba5ddf88acedcb163fa1bee4234a612ffac7c9d2
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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