Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c4dd78ef56a708…

MALICIOUS

PDF

101.7 KB Created: 2021-08-12 01:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5036ea3f37ba60af9c22c245955a4414 SHA-1: 3c6da37d7a40e10752c183cd70b37bc7bf8a4470 SHA-256: b9c4dd78ef56a7081ce5c41ef765efab61b3811763676f7954e3a144e639b68b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL findings are indicative of a malicious PDF designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://personnelstrategies.net/userfiles/file/besabukafonabubowos.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51f62f4e8d44067ee2ad89886c1c1416/gonasemopizubagaforadawo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0470d5b70f886735688f3df1b65124df/sibupugurowes.pdfIn PDF document text
    • https://people11people.gr/uploads/File/29417183902.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c449ea94c---17845455771.pdfIn PDF document text
    • http://iltorg.ru/upload/file/79416290999.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/xumusinomafisopujorusaw.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/56334331702.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/70221777155.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/xakimewifixare.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/83135372829.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161028a9bb0850---zutuvijemumidagepudar.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f35486d5d0930e7442fcd057c2e1bd1/96376082259.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///kowopiratefemiw.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/jowabetigojixareru.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9e79313e---vadumujet.pdfIn PDF document text
    • http://learningkey.org/userfiles/nanoxavuxukupumitozakopa.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/walasakifofufupufupe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160776e491be22---49073487642.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced98cd2b49---bomupisasuloru.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/kedizages.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-6/20210806120946687453.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/844127914.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e83e2f6d512---fajokafagojuxapesag.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210619_224738.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16092a60b266a5---30557419509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=beryl%27s+chocolate+financial+reportPDF 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_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 10780 bytes
SHA-256: 2b6f0abdee3ebd7d25416e6594a20dd03b7f2fe1dbc4dec8ad10778dd5605445
font_01_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A57 17656 bytes
SHA-256: 25b320dc64b95ec29d04c46f3b42fac862a39923cc8d26199935a281d40d9f2b

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