Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c3627baec7c9b1…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 08:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e837728115eb60f40b8ca8f00136e58e SHA-1: 433a6e984090618384865dbac3e281dc6f4460d6 SHA-256: f2c3627baec7c9b1b59a9a2db7ae74038504e9d5f62e01a84e1a24827686a73f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites, suggesting it's designed to redirect users to malicious content. The heuristic firings indicate a link farm strategy, likely to trick users into downloading malware disguised as a game. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://irlanc.ru/uplcv?utm_term=marvel+super+war+download PDF link annotation
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143860f519d6---komaxusuzopilemenava.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/45467262826.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/wujifofikut.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/45152668952.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gevigilop.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97578862817.pdfIn PDF document text
    • http://sdes.in/uploads/miwomafajunipuvikunopekur.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/32559203183.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/nomodixozalobe.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/82730386619.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/nulolejixanapetijikuvu.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/sarawiwavivigunaveze.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/63370952267.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/fazefabefeweb.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/77327862439.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/dixikubanurokasozarovo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7592e2e2d6ed2b3435f9d2f01331e67c/55492009600.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/22723324214.pdfIn PDF document text
    • https://icbacademy.com/upload/files/49493164252.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/pifudusulufozikovo.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/88952708495.pdfIn PDF document text
    • http://chinalabware.ru/d/files/74310533887.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/q7ed1u8trep8q3dsb0q0vkn7k0/42867424048.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 21920 bytes
SHA-256: 2e9d668c693bc853f7f55f2fc18ef5e648ad468c371842d07fd4b372cc828330
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 10440 bytes
SHA-256: 18aee436c5137034df1a6f98c7340b8dd84f4dcad58e5b7ec03c5834bdf0caa1

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