Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d746e0e0538008…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 03:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b55f7945e4c6e88d624cd9988e082be5 SHA-1: 91042d08af5cfea8ef8ed18dafa2fb1be94416b6 SHA-256: 40d746e0e05380084b9406711d06b6672926d8d8449be951bd7d436aeea53bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests tracking or redirection for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=penelope+douglas+corrupt+read+online
    • http://lovesushiscv.com/uploads/files/disero.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b846528b18---rolox.pdf
    • http://automotiveenergy.cz/userfiles/file/51471004319.pdf
    • http://alompar.hu/uploads/content_files/files/bariwarapo.pdf
    • http://ppfi-online.com/userfiles/file/mixakofene.pdf
    • http://nataliashishkina.com/userfiles/file/18464545163.pdf
    • http://avanti.pl/userfiles/file/39195419931.pdf
    • http://nguyenthaotech.com/upload/files/mevopiretenisunulu.pdf
    • http://x-mobio.com/upload/files/walinevis.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede887f33c---moveg.pdf
    • http://indigobaby.eu/upload/files/juwad.pdf
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/63452762053.pdf
    • http://vibrobeton.by/pics/files/6334333084.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d352556ae4---83343263353.pdf
    • http://www.catedralirodahaz.hu/data/editorfile/xekovuwakoka.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/loneraluz.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/zefiguwiloneruf.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f5f29e48e167d57fd3df81d12b8aa524/87188926696.pdf
    • https://detmers-kontejner.hr/files/kizabibumejuxofivurojomag.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c87f6e246a83e7b6fd19d06f8460b9f6/mumalabok.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/85916088195.pdf
    • https://esperidiaogomes.com/userfiles/files/55617190132.pdf
    • http://neo-net.info/giganet/files/file/94142997914.pdf
    • http://railwaysrailroads.com/upload_files/files/lixopuluzepemifiv.pdf
    • http://chemtron-vostok.ru/media/file/vivanopapubeworigukegadag.pdf
    • https://luatsubienhoa.com/upload/ck/files/fasejepatevixubaget.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/jobulopam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 16792 bytes
font_01_sfnt_off000110c7.bin
f9aad91ec532e1c76987778a392e51029927379065a3a12e684b0a81ccdbd6f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 18412 bytes
font_02_sfnt_off000140b4.bin
43db9348bc73802bbc0c879478e8f2b9efc011c6e58e7f6d23816132c4f544ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 10788 bytes