Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89b5ef5617f8520…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 03:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef7376f6c10c8bb09764a1a98ca3610f SHA-1: 7dbe240f50e033a75b3b42010cd215d77a1ced0b SHA-256: e89b5ef5617f85207f35d0794fd1139b89c24c77965f4827a1aa09c2002ef0bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm designed to host or redirect to malicious content, with one URL pointing to a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a payload via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hkfew.org.hk/ckfinder/userfiles/files/suwulijuwegapanekikaxof.pdf In PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/50622617981.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/bifumofanevowisugadu.pdfIn PDF document text
    • http://jonme.net/ckupload/files/wunamosotoz.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/sixovomidifisigameb.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/18087083181.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofibuxabaposo.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/5733164651.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/92202161466.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/limodilajirav.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r4inqm4t1f90hv3vj4f44mgb4/zixonutesugoxesoxod.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/je1hfrnnn0adqnrt93ghophss2/85830411051.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/58634740453.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/winudijajopuronefezakofa.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/4986116312.pdfIn PDF document text
    • http://keramann.ru/uploads/files/97323971143.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rupelezegamizolez.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/90071925357.pdfIn PDF document text
    • http://secretinvitation.net/images/files/tatalowenotakuzeluribemu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zolobopus.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613378ac59c20---vozikubipora.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/74980847030.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6t7t4aardl26rdnc6pstr01ehe/34830025815.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lunokilinopevokepurewufed.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/zidemukudofugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=trapcode+form+crackPDF 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_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 10328 bytes
SHA-256: 942cd406297ef600e252676849906c2870ef6b5064d2aac061d8e2ded8352fa0
font_02_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 21776 bytes
SHA-256: 7fb86c774272b3570a32e0e6b2a4a3c129a80760b23995364b26ca1a1435cc96

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