Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fee80a3cc3ace3…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bb01d5f8ee7f3b1eab101da242ff1e8 SHA-1: c860190d4293efbe63cb0dc8676cd6a558d6766e SHA-256: c7fee80a3cc3ace398c389445533f84b93b26b329692f005ade0898a0a305969
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, directing users to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4205d33c---gavekorofitapopin.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4dsv86fk46splk1ar2t1ojl4c8/sudomise.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/30ris5nrqo3meqtip8li2at6jh/rinukevejokigofobafakuta.pdfIn PDF document text
    • http://asfalon.com/__files/file/35587311723.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/6560541441.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/94001645685.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/vatutafidujazopegajewof.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a494bf665---bomevagaguvasojazezu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/29352636603.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5hni1oksnv5lmkahlps2lfalui/93116565020.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2ce3967f80e7d7ac0e28a711b9014eb6/24751987064.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4607928f02---60601551327.pdfIn PDF document text
    • https://bliznacite.com/files/70669616736.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/91846486970.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/vakigelibasapolavobe.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/zuganiridibuv.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/80796046732.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/siporemobunel.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/tosemumevikegemudik.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/86755241395.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/23973378064.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/4115390041.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/32855657673.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/sawunafevem.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4ea2ccce5---kezagonalem.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085459099b72---xawumufamekalezirawazof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=project+investment+analysis+pdfPDF link annotation
    • 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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 16752 bytes
SHA-256: 61aa93d4d3df4b78cc60372fca414b933b8a3332414cebb1e26a0d2979fe8d89
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 11092 bytes
SHA-256: 63ac19f061bbbe58754b56766d43b501b42314726bc962a877117646798a92f1
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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