Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4896aecdaae6ae…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 01:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b44221a94e874e0793060a87d58d204a SHA-1: 3c85f528f3441dc6c690f8beb95bf1dfcf9a256d SHA-256: ec4896aecdaae6ae0252bc2d3299e59ff8bcc13c3f3c92ece6bb228b5a242a26
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and URL patterns suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=how+to+transfer+data+between+phones PDF link annotation
    • http://electrogalicia.com/electrogalicia/recursos/archivos/supifolutixunifunudewof.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qaq5utf8t7vm1s0c8dho3vaij5/14740395059.pdfIn PDF document text
    • https://huanghecables.com/d/files/48559374751.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/topoke.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/paxeka.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jamatiletuxaju.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/zuratofipivunigominiri.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/59009438330.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/40132351031.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/23477213298.pdfIn PDF document text
    • http://lg-palette.com/upload/files/vukobavepilupuxoxegelabu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161463ea30c467---ruzitofikafekasov.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ff869cc4ae051bfd383a3e02d5db54ea/gimikunaxovinimirediwan.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/48030871189.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/82736408445.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/69756791701.pdfIn PDF document text
    • http://koutingchina.com/upload/files/xovugojifakumamulakewa.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/luzikuril.pdfIn PDF document text
    • https://mashura.co/userfiles/files/16020507583.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/85411415049.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/verasezofivukup.pdfIn PDF document text
    • https://limsurdua.com/contents/files/90638694759.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/jevezunixipozodomaw.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/5366422579.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/21772837392.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/foresinurebiboti.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/punutipomi.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/purelaxo.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 17268 bytes
SHA-256: a45b4c3441ca1adf32904fcf643083f0c333247da556ed8912fabf269fcab8df
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 10676 bytes
SHA-256: 831e97e6c353c6c11a9aed56c5ebdd74692a6e906a1d0e86fd5ae943f7c3842c

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