Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccb5378229318fa…

MALICIOUS

PDF

96.5 KB Created: 2021-09-02 09:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a6b2adfc7f8ce7dc02516d14c66149a SHA-1: 45c97c615c3a2e5f47da206072ad08a42ef8f411 SHA-256: bccb5378229318fa864a6e156e1eabae2b8b67e1ed6cb189a7b02443772c1477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sity-luxe.ru/userfiles/file/maboxemulop.pdf In PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/be0118bbdc0b070457eb820775ca4f43/65961962516.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/zukafamorez.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tvlabdpo453qca019lo7st96i4/19348284214.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/74413467220.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/60747230896.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/60333288660.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/6693420857.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/48386953467.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/semesotegananitaluna.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/13694114521.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/sofixerufisodike.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0de4efd2---nuzir.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/wukapisivexesezaxu.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/xesabino.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795113c67b6---68353103634.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984dd8c5304---dumuwerefesisop.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044aa7ce765---wenopeb.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/xopidepugunezamerapov.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16255468827028.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/60662424207.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/86721989246.pdfIn PDF document text
    • http://arslanemlak.com/E/file/lozefinatomekefokozifu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608545f7f2dd0---62545188121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=air+fryer+beer+battered+fish+and+chipsPDF 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_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 19544 bytes
SHA-256: 3fbacea5ff5c87ab0f6629f2f1ca063a94079025fc8417006531dbf6540c2ffc
font_01_sfnt_off0001438c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438C 10784 bytes
SHA-256: 4850ac13202bbdbfb630e2dd41b898dc54f967a1c03c3f84415cf9b878def706
font_02_sfnt_off00015c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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