Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14e9b16e78147bb…

MALICIOUS

PDF

92.7 KB Created: 2021-09-19 11:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11cb513b5962489500799c355fcddbf1 SHA-1: 105ea66b912810fda0de2f6cae80ec41583c031d SHA-256: a14e9b16e78147bbde91743c066d385568b4f28f6fdaf3baab68bcd3a05cfb40
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports the classification of this PDF as a malicious lure.

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614502d65f807---lizan.pdf In PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/lufupubusupifozebe.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/namelexodipafewoxim.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/fozubekafukozabenog.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/xijoraminojowejurukufo.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/kebevuposofopu.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/96215316491.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
    • http://vuason.vn/upload/files/resivajeb.pdfIn PDF document text
    • http://vtaky.sk/media/file/26269283435.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/24942270703.pdfIn PDF document text
    • https://partetesal.ir/data/file/43903234133.pdfIn PDF document text
    • https://epiphanych.com/images/file/gulevilibagawuten.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/xopavafivolovusene.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/novesogupasavelonepokimos.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/46998408596.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xidabizevumafupowawemubul.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142a38446e20---37100338130.pdfIn PDF document text
    • http://royalgroup.at/tmp/31893634130.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-2/20210902065122544641.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210917075418-fosububi.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/17435176852.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/xasakenelukuvunu.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/nasitugowo.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/boxetojewariduwi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335daf7fc79---tufikolexolimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lightheaded+for+daysPDF 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_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10552 bytes
SHA-256: 99206acefb9326469ebc31fbb2c3eeb58dfe727206629a67a47605a142187347
font_02_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 17192 bytes
SHA-256: 616aecfea32bedfb8600f9c8c85c9d99db078e24bd1a7bb76c54a98287ace8b8

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