Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba74e63279d0996…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 20:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c82d03eb5ae0515773f6de969a63578 SHA-1: eeefab77a72f0a31ccbbbfb0393d52765a37a384 SHA-256: 2ba74e63279d0996c64e79cbfa29a794cf4c902f44d6100fd8c8c0b5b79914a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL distribution suggest it's used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://soepcentrale-dekeyser.be/userfiles/file/20822178980.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/xiposujepovazafiked.pdfIn PDF document text
    • http://sbairs.com/datas/files/80235441754.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kutuvebixowijubepe.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/59v2chstlmppjlgfekl48t37d5/82691902525.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/58335362429.pdfIn PDF document text
    • http://01host.ru/userfiles/files/buluduvolesobosutavijus.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901071323182507.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lofosor.pdfIn PDF document text
    • https://bursac.net/userfiles/file/74871106202.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/begumepedobesix.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ed3f009d---temalaba.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130436c8e228---jodezopimawemupotejak.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/45203872838.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/kedepijumapagolux.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161325b6272189---nukomegefovetepipuwujut.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/17333274369.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/273a38a897c6bb017b35f422e390d682/dutovapimetelinukubuto.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/92192876849.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/27010259336.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/29204871387.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138422ca7075---rokevitofaxekatepulelura.pdfIn PDF document text
    • http://newcityhk.com/userfiles/wazulugowufum.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tinogupirazavagaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=japanese+verbs+conjugation+table+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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 11220 bytes
SHA-256: 3e575d26bebf207bda3b24f5c09e5b43fcd092f7ccb25757d9af330244881db1
font_01_sfnt_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 16340 bytes
SHA-256: 1986e3f6f6a9e2784112996411326adbfd882ee87bef6ff191019ee1d95ac907
font_02_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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