Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4d6a53a0fba240…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc919b92825fa6baeb4da0f3c1644c7e SHA-1: 03d6efd95ede2bb38ec837b20db6200f76508169 SHA-256: 8a4d6a53a0fba240978d7037327e23ca8318eec8b6c38e3c2ca48cb7edaf001a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malware or redirect users to phishing pages. The presence of JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=strix+tv+apk PDF link annotation
    • https://art4you.sk/editor_uploads/system/files/905678881.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/87362129542.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/norosojanafukafusagave.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aee2740ac---28424113241.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fe67693ac0b333f992e573c5f720fbc0/mubebimofixudojetugix.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59831e3cf---rovegorunuwumimuxi.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/riniwitana.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/71044441331.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/67651427525.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/wegetasi.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/wowapeberijuwefebid.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/29031720613.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/10656828492.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/40553887107.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_D7321C0F15E400D3.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/fagizudusewutepizizerotiw.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/23613670230.pdfIn PDF document text
    • http://cncsprings.com/d/files/63565697508.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/34998940385.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fksariu3rouibap6gp5moh300j/82220565378.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1e96e6c6---kofawezepinugepaniza.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/30835868878.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44ef0395d---18471965171.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gibewikiz.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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 10008 bytes
SHA-256: 6ce434dc95a2a773a1ffb6371d5ca7b98a99b41b4ed7f1c49d25d47a3d7fac2d
font_01_sfnt_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 15924 bytes
SHA-256: b41a9f15ac37abe7b3b3b5d79783d04740992d5746e35bc269be9209c004ac15
font_02_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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