Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b359994d909f18…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 15:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf21ab3207113326b803f36984c910fa SHA-1: 3475442fbc378946a680aacda2eb6138db46b922 SHA-256: b3b359994d909f1885d53d99fa963d3b0c9472660ca187cc4f93aef340974855
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the 'Urgency / deadline lure' heuristic suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d881115de5---wijoxavufezeboxinuzofeju.pdf In PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/dnd9ds83irr3e6mdqralumorl7/nowobidudokalarefin.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/kiwepubajad.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/kisezejonus.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u22mcgrno12epfjjjo9k0jnedt/44773016651.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad355e2c1---lilafepugujujeda.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8ad9623e2---7539530563.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435e8d9159---2415791745.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f5e26d79a---liwuwidanitu.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/zonafipuluxakuxegufija.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090688c9caa6---jivem.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zakexirewesexiso.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f6c6414f72e740ec3d04423fb786f035/falexabonovotebuv.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610055fa04f5e---9937744102.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/64695340911.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/19373869191.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/fugudemegeji.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iil0qik64m7a3i5u17bsfqgc38/resulubanafi.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/dubemofo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/zapajak.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/71613284051.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/lotoluluxozatifatufegub.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/nexetewalewalavisat.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/13732060583.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2277b12fd---85113577365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=define+citizen+and+citizenship+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 10512 bytes
SHA-256: fafad59823a5497842e865e2153f76ba6c62de7fd92129a7d5467f334f5f7fc6
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 18368 bytes
SHA-256: 0f5d519bda75fcb8dea5f9bae300b816faaae4b839e0f34821d2c0428f5185c4