Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc1b1035dc59e1f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 04:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c80c82d474cec9df84901ce6cc6927b SHA-1: b32b40a016b15738f52b31a56f8aea2ba6b3f240 SHA-256: fbc1b1035dc59e1fa0744c264bac8a9fb8fc37cd15734484e2cf5a1b9cd2f860
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm designed to redirect users to these potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=technical+drawing+text+books+pdf PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/848b613a9c065173733971eda522e66c/fovezatopexejulagipare.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0490383f72---supakatosavedipasivopap.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a78a2da90---29305347404.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86dd1a1b1d---saxitogakipotamilabewatow.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cd9abd61c22beb03ff2730910f840cff/47478507381.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06a224d641bb64dd487ef783532169ae/xofobudigekezi.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kufedal.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/51444633027.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0f84a2dfd68e5cc2293d91b407f93c83/83716106636.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3e16c686---rogixuzozojutenevewe.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zinanofubuko.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/gewexegozodejirenewuw.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b5decbba---63600149302.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///53974538441.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/zedufokasajoxogejewo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/88948376672.pdfIn PDF document text
    • https://luminex.pl/upload/file/30288026935.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/vafaxobemowibugoxowito.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108240530337771.pdfIn PDF document text
    • http://hncastlecable.com/d/files/pedazoxidawofiku.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/wazubomo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/80a394558e818b81218de32b32944d88/femuzuvobo.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/3358133335.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kr3p9s5c49g3mag3eap51rifi6/1742987174.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/pilulasepaporonupenite.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/38441454685.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_off0000bbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEC 15116 bytes
SHA-256: d1f3c18e0282232e5099ddb5e12099e8363162f17d0523ecfbe4698243d4ac60
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 11284 bytes
SHA-256: 6764e09bacb124b30279d413e042b767064bec477f9b16c047a4acbdf9421249

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