Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43571d4a99218f1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 14:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2d1ae8eeae36a3921efa7f5a8917b0f SHA-1: 04167cfb0767eeeddc5868a0f2009d2c68429760 SHA-256: f43571d4a99218f1d0001b49042189dbae454eada8a333a427c31400d3bfdcc6
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs forming a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URLs confirm a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=hack+mod+apk+app PDF link annotation
    • https://xulynuocphangiathinh.vn/images/pic/file/netisudujabekisesaxijovaw.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/pokusowaf.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/96616076078.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/35285386549.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/77879562489.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/talinovedamitijew.pdfIn PDF document text
    • https://izometal.net/mm/file/52676687206.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/nutiwelosineg.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495f338a246---notolowinif.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/difavanijasatedemi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zoxedofudivovad.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/50382330226.pdfIn PDF document text
    • https://12shio2.com/contents/files/81578732592.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/93063126623.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/81429541632.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/20929517370.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/niwametipuwozemiza.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/senofop.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/2667029253.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/89429299639.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/moduzelanapinuveji.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/481113c07bcfcfe8aa3fca2db3cda81d/detupemazukavofubetagubi.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/68735673782.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/2397736105.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440942559be---dododagivupazumoxenob.pdfIn PDF document text
    • http://adice-area.com/pictures/files/zewizuwodijaxib.pdfIn PDF document text
    • https://zagi.hr/files/99475819162.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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 10020 bytes
SHA-256: dacf96e53f28f20cb91080a3e0d6658fc37aa669c0c0735bf61dd9ae7e655d44
font_01_sfnt_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 15100 bytes
SHA-256: f219968aa9b43f966aa71d9684dd45d6e4d61553d0598ace3f751fcd6151df3c
font_02_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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