Malicious PDF — malware analysis report

Static analysis result for SHA-256 194e728fcf597269…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 12:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5c0cf6f2ee9a92ca106f39204e1bf25 SHA-1: 4bb29a53daf8c564dc0b037cd1777c653bc99767 SHA-256: 194e728fcf59726924e1aa3ba6516ef50e7fe060ace78da8222140e127699925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://tecs4.com/intranet/ckfinder/userfiles/files/60439683269.pdf In PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/zudido.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/maxeziremanezuwi.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/90558752484.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6908e04bb270335eceb0c43e827cfca7/bedexave.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/27349345465.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/sifanubidepigawadurefuwas.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117e6ec2791f---lerugexutefojozupejarisav.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3418b181c41d8680c40050e263a62621/73030418184.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/bigisuzaboxepubexupado.pdfIn PDF document text
    • http://esejsc.com/upload/files/52683626020.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/76345867250.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b884f88819086c4acc9b86118fd53e97/49302111449.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/degugamefisovagutofa.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0erl5issqf5oba486snju2o9cb/63290523602.pdfIn PDF document text
    • http://markone-tools.com/upload/files/39042416698.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2640c9b4---94951423358.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/muvobezutonob.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/vokukowu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/353a82220063e52e061280aaaf38aa9a/5779739529.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bedotemizibowekefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+create+lightning+effect+in+photoshopPDF 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_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 17984 bytes
SHA-256: a88cd51019e13a9b6f383e8a0e103d24a8c4caab88fe9cb4bf23a3df0a2c4ecc
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 10836 bytes
SHA-256: 2f9fd644767afa0ea0359f554e2a4d9ada6aac54372a9e01de560cf0c5ce21b7
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1