Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adc95d1569509e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 16:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc8b0c27214b0a5ea6a581b6d15f3413 SHA-1: 92c73362b48f94b92a0d03af47f85f323165f7c5 SHA-256: 4adc95d1569509e39bfee08b0c1e7fe9c69400a78e9d70430e9954874e7988a7
156 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 numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=english+oral+exam+questions+pdf PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0af995bac91959d8ec97f8ea3622a8f7/sanonero.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/kovim.pdfIn PDF document text
    • http://landpas.pl/upload/file/tifuvevokiwadupojevejiz.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109050148028341.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/pakuseselog.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/49831248959.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38406453640.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/78390218845.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kosebus.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/topodojodutidudomedoduv.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/3351871755.pdfIn PDF document text
    • http://ccadl.com/files/20210903204511.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/malowo.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/29490846333.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80298418882.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/paloro.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/1620111591.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/wodufam.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2bb6e83dd147e7b6acbae18dface42bf/34562083182.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/31411093248.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/semeselezikipelomipotoke.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tq7kl98h42fg2k7ri9el592n00/73190242578.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0fa26d2af---64705250933.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/35926779029.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 11276 bytes
SHA-256: 05c36ada4d343a5bd3bc647c4ed752b634579bd81f47807c49924f39276cf7d5
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 17960 bytes
SHA-256: 6f5210dbb4704994035732d6ef5f6c8a5c44be6a7adb6b9fcc0f34897ce31a09
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.