Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57d4e6d2a1a703c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 11:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcadc9721d07805c18bf665c5e8beb80 SHA-1: 7c7ba5ff3c6bd6e7b2629910af71c15acd2a7ee9 SHA-256: a57d4e6d2a1a703c0f5991c845faf2dbffd9f14a034e59c1157cf8cbc856782e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=download+instasquare+apk PDF link annotation
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/1110470006.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/43531966403.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/gijidivazoparu.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/39614456247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd783d7e---12044578008.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/80161601256.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613980ab8a529---gisomuve.pdfIn PDF document text
    • http://dlzj.net/upload/files/202109080315393722.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/pivomogagaxeluburawis.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/sejobe.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/mivoravi.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109162347042230.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/43799652590.pdfIn PDF document text
    • https://alariel.be/userfiles/file/jorumodolu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ch2ff9i6bvp4q1luvpdbsa5qsq/jetep.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3a4284b---kepujekuwanaruza.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/zeramakotoxosubufu.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vivonixofudawu.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/godik.pdfIn PDF document text
    • https://regenerateacademy.com/file/kazediwomamitumet.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/47541097520.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/nivokawu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/34445941570.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tubovakunizesape.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/napumoda.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/21020032001.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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 17868 bytes
SHA-256: d832a1869b01330e2bf37dd1a2735a031b596a25dc5dadb0b3679e6010dc3410
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10812 bytes
SHA-256: 2a64aa0c7b29760ac4b63aa71447ea810391da038cbcb7e878740c7ca0fb969f
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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