Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d962d4bc61bc0b2…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 16:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d35b0bb5ea477490b7fe2b4c6b7b986 SHA-1: 0624a23400e9acc582f729f5476afe841691320e SHA-256: 3d962d4bc61bc0b209f4c74e900bdd063c411e1734a8a64302eb8f9d2e2a8ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e7d815e343ae96993acba5da833e71ea/nofebetedo.pdf In PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/ladivutejajanuxapatin.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/n4iuocqq520r86u3rmhv80aqm4/bibazanitorug.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9cd54f74---79467419074.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/nexejuf.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/12363496586.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/jupevifamunekoxobom.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/39592234746.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bafca7c4ef---94733453442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5eddeaca---gejitujiji.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161086c04426ed---gesokagegog.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df964257cf829d91a3276f94db766ef0/60542490891.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/ruluwepubem.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d1471e4cc695b15057e1c6959c588cd6/26797645980.pdfIn PDF document text
    • https://service-panev.com/userfiles/jojowov.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/fezidomipiw.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/54692908339.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/kapuxi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lugeburarugudil.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/wozag.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1ae7669cc86b826525d677b06b29b761/608434772.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6277bf63031e7b76369fa0f21068a115/8361960984.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/6899791872.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210709222946.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/jqnvlnbnossjhilphuh90cb2f9/27866990860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=present+perfect+tense+active+and+passive+voice+examples+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 16452 bytes
SHA-256: b74108f5ca41706a77133afd68be746adda786665b9e0ce38b0d9c10dc1c52be
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 10948 bytes
SHA-256: 735523beab44b6b098a9a56ef15d5c795810dfa203108e7f453df78ecbbb4f1a
font_03_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 2160 bytes
SHA-256: d35cd7befe0e13644f611e809c6d233f3546688d22d6aa47982a121dfa8fbcf6

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